156985431 has 8 divisors (see below), whose sum is σ = 209497344. Its totient is φ = 104565240.

The previous prime is 156985379. The next prime is 156985447. The reversal of 156985431 is 134589651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-156985431 is a prime.

It is a super-2 number, since 2×156985431² = 49288851092511522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156985471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18831 + ... + 25856.

It is an arithmetic number, because the mean of its divisors is an integer number (26187168).

Almost surely, 2^156985431 is an apocalyptic number.

156985431 is a deficient number, since it is larger than the sum of its proper divisors (52511913).

156985431 is a wasteful number, since it uses less digits than its factorization.

156985431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45861.

The product of its digits is 129600, while the sum is 42.

The square root of 156985431 is about 12529.3827062629. The cubic root of 156985431 is about 539.4523838054.

The spelling of 156985431 in words is "one hundred fifty-six million, nine hundred eighty-five thousand, four hundred thirty-one".