161931310 has 16 divisors (see below), whose sum is σ = 291692016. Its totient is φ = 64724608.

The previous prime is 161931283. The next prime is 161931311. The reversal of 161931310 is 13139161.

It is a happy number.

It is a super-2 number, since 2×161931310² = 52443498316632200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161931311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10317 + ... + 20743.

It is an arithmetic number, because the mean of its divisors is an integer number (18230751).

Almost surely, 2^161931310 is an apocalyptic number.

161931310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161931310 is a deficient number, since it is larger than the sum of its proper divisors (129760706).

161931310 is a wasteful number, since it uses less digits than its factorization.

161931310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11987.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 161931310 is about 12725.2233772142. The cubic root of 161931310 is about 545.0591188008.

The spelling of 161931310 in words is "one hundred sixty-one million, nine hundred thirty-one thousand, three hundred ten".