231216945 has 8 divisors (see below), whose sum is σ = 369947136. Its totient is φ = 123315696.

The previous prime is 231216919. The next prime is 231216961. The reversal of 231216945 is 549612132.

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

It is not a de Polignac number, because 231216945 - 2²⁵ = 197662513 is a prime.

It is a super-2 number, since 2×231216945² = 106922551310266050, which contains 22 as substring.

It is an unprimeable number.

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, 7707217 + ... + 7707246.

It is an arithmetic number, because the mean of its divisors is an integer number (46243392).

Almost surely, 2^231216945 is an apocalyptic number.

It is an amenable number.

231216945 is a deficient number, since it is larger than the sum of its proper divisors (138730191).

231216945 is a wasteful number, since it uses less digits than its factorization.

231216945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15414471.

The product of its digits is 12960, while the sum is 33.

The square root of 231216945 is about 15205.8194451993. The cubic root of 231216945 is about 613.7712660435.

The spelling of 231216945 in words is "two hundred thirty-one million, two hundred sixteen thousand, nine hundred forty-five".