161731092 has 24 divisors (see below), whose sum is σ = 389546752. Its totient is φ = 52171200.

The previous prime is 161731079. The next prime is 161731093. The reversal of 161731092 is 290137161.

It is a super-2 number, since 2×161731092² = 52313892239024928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161731093) 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, 217009 + ... + 217752.

Almost surely, 2^161731092 is an apocalyptic number.

161731092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161731092 is an abundant number, since it is smaller than the sum of its proper divisors (227815660).

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

161731092 is a wasteful number, since it uses less digits than its factorization.

161731092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434799 (or 434797 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 161731092 is about 12717.3539700678. The cubic root of 161731092 is about 544.8343822436.

The spelling of 161731092 in words is "one hundred sixty-one million, seven hundred thirty-one thousand, ninety-two".