232161391 has 16 divisors (see below), whose sum is σ = 290315520. Its totient is φ = 180362880.

The previous prime is 232161317. The next prime is 232161403. The reversal of 232161391 is 193161232.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232161391 is a prime.

It is a super-2 number, since 2×232161391² = 107797822942109762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232161301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22375 + ... + 31063.

It is an arithmetic number, because the mean of its divisors is an integer number (18144720).

Almost surely, 2^232161391 is an apocalyptic number.

232161391 is a deficient number, since it is larger than the sum of its proper divisors (58154129).

232161391 is a wasteful number, since it uses less digits than its factorization.

232161391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9054.

The product of its digits is 1944, while the sum is 28.

The square root of 232161391 is about 15236.8432097991. The cubic root of 232161391 is about 614.6058161001.

The spelling of 232161391 in words is "two hundred thirty-two million, one hundred sixty-one thousand, three hundred ninety-one".