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142981 is a prime number
BaseRepresentation
bin100010111010000101
321021010121
4202322011
514033411
63021541
71133566
oct427205
9237117
10142981
1198473
126a8b1
1350107
143a16d
152c571
hex22e85

142981 has 2 divisors, whose sum is σ = 142982. Its totient is φ = 142980.

The previous prime is 142979. The next prime is 142993. The reversal of 142981 is 189241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133956 + 9025 = 366^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 142981 - 21 = 142979 is a prime.

It is a super-2 number, since 2×1429812 = 40887132722, which contains 22 as substring.

Together with 142979, it forms a pair of twin primes.

It is a plaindrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71490 + 71491.

It is an arithmetic number, because the mean of its divisors is an integer number (71491).

2142981 is an apocalyptic number.

It is an amenable number.

142981 is a deficient number, since it is larger than the sum of its proper divisors (1).

142981 is an equidigital number, since it uses as much as digits as its factorization.

142981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 142981 is about 378.1282851097. The cubic root of 142981 is about 52.2908991984.

The spelling of 142981 in words is "one hundred forty-two thousand, nine hundred eighty-one".