152431681 has 4 divisors (see below), whose sum is σ = 157348864. Its totient is φ = 147514500.

The previous prime is 152431679. The next prime is 152431693. The reversal of 152431681 is 186134251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186134251 = 53 ⋅3511967.

It is a cyclic number.

It is not a de Polignac number, because 152431681 - 2¹ = 152431679 is a prime.

It is a super-2 number, since 2×152431681² = 46470834744971522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4917151 = 152431681 / (1 + 5 + 2 + 4 + 3 + 1 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152431621) 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, 2458545 + ... + 2458606.

It is an arithmetic number, because the mean of its divisors is an integer number (39337216).

Almost surely, 2^152431681 is an apocalyptic number.

152431681 is the 7809-th centered pentagonal number.

It is an amenable number.

152431681 is a deficient number, since it is larger than the sum of its proper divisors (4917183).

152431681 is an equidigital number, since it uses as much as digits as its factorization.

152431681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917182.

The product of its digits is 5760, while the sum is 31.

The square root of 152431681 is about 12346.3225698991. The cubic root of 152431681 is about 534.1850707721.

The spelling of 152431681 in words is "one hundred fifty-two million, four hundred thirty-one thousand, six hundred eighty-one".