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142521013 = 178383589
BaseRepresentation
bin10000111111010…
…11001010110101
3100221011211002001
420133223022311
5242441133023
622050415301
73350260105
oct1037531265
9327154061
10142521013
11734a4168
123b891531
13236b097b
1414cdd205
15c7a36ad
hex87eb2b5

142521013 has 4 divisors (see below), whose sum is σ = 150904620. Its totient is φ = 134137408.

The previous prime is 142520971. The next prime is 142521019. The reversal of 142521013 is 310125241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310125241 = 2571206713.

It can be written as a sum of positive squares in 2 ways, for example, as 123143409 + 19377604 = 11097^2 + 4402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-142521013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142521019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4191778 + ... + 4191811.

It is an arithmetic number, because the mean of its divisors is an integer number (37726155).

Almost surely, 2142521013 is an apocalyptic number.

It is an amenable number.

142521013 is a deficient number, since it is larger than the sum of its proper divisors (8383607).

142521013 is an equidigital number, since it uses as much as digits as its factorization.

142521013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8383606.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 142521013 is about 11938.2164915870. The cubic root of 142521013 is about 522.3476359538.

Adding to 142521013 its reverse (310125241), we get a palindrome (452646254).

The spelling of 142521013 in words is "one hundred forty-two million, five hundred twenty-one thousand, thirteen".

Divisors: 1 17 8383589 142521013