145871729 has 4 divisors (see below), whose sum is σ = 146099940. Its totient is φ = 145643520.

The previous prime is 145871717. The next prime is 145871749. The reversal of 145871729 is 927178541.

145871729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60031504 + 85840225 = 7748^2 + 9265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145871729 is a prime.

It is a super-2 number, since 2×145871729² = 42557122642898882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145871729.

It is not an unprimeable number, because it can be changed into a prime (145871749) 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, 113144 + ... + 114425.

It is an arithmetic number, because the mean of its divisors is an integer number (36524985).

Almost surely, 2^145871729 is an apocalyptic number.

It is an amenable number.

145871729 is a deficient number, since it is larger than the sum of its proper divisors (228211).

145871729 is an equidigital number, since it uses as much as digits as its factorization.

145871729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228210.

The product of its digits is 141120, while the sum is 44.

The square root of 145871729 is about 12077.7369154987. The cubic root of 145871729 is about 526.4094901965.

The spelling of 145871729 in words is "one hundred forty-five million, eight hundred seventy-one thousand, seven hundred twenty-nine".