231216386 has 8 divisors (see below), whose sum is σ = 347171340. Its totient is φ = 115492608.

The previous prime is 231216361. The next prime is 231216389. The reversal of 231216386 is 683612132.

It can be written as a sum of positive squares in 2 ways, for example, as 224430361 + 6786025 = 14981^2 + 2605^2 .

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

It is a super-2 number, since 2×231216386² = 106922034309801992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231216389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55271 + ... + 59306.

Almost surely, 2^231216386 is an apocalyptic number.

231216386 is a deficient number, since it is larger than the sum of its proper divisors (115954954).

231216386 is a wasteful number, since it uses less digits than its factorization.

231216386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115588.

The product of its digits is 10368, while the sum is 32.

The square root of 231216386 is about 15205.8010640676. The cubic root of 231216386 is about 613.7707714165.

The spelling of 231216386 in words is "two hundred thirty-one million, two hundred sixteen thousand, three hundred eighty-six".