161531526 has 32 divisors (see below), whose sum is σ = 348495840. Its totient is φ = 49618944.

The previous prime is 161531497. The next prime is 161531551. The reversal of 161531526 is 625135161.

It is a junction number, because it is equal to n+sod(n) for n = 161531493 and 161531502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58636 + ... + 61328.

It is an arithmetic number, because the mean of its divisors is an integer number (10890495).

Almost surely, 2^161531526 is an apocalyptic number.

161531526 is an abundant number, since it is smaller than the sum of its proper divisors (186964314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161531526 is a wasteful number, since it uses less digits than its factorization.

161531526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480.

The product of its digits is 5400, while the sum is 30.

The square root of 161531526 is about 12709.5053404922. The cubic root of 161531526 is about 544.6101928812.

Adding to 161531526 its reverse (625135161), we get a palindrome (786666687).

The spelling of 161531526 in words is "one hundred sixty-one million, five hundred thirty-one thousand, five hundred twenty-six".