231620156 has 6 divisors (see below), whose sum is σ = 405335280. Its totient is φ = 115810076.

The previous prime is 231620119. The next prime is 231620173. The reversal of 231620156 is 651026132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28952516 + ... + 28952523.

It is an arithmetic number, because the mean of its divisors is an integer number (67555880).

Almost surely, 2^231620156 is an apocalyptic number.

It is an amenable number.

231620156 is a deficient number, since it is larger than the sum of its proper divisors (173715124).

231620156 is a wasteful number, since it uses less digits than its factorization.

231620156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57905043 (or 57905041 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231620156 is about 15219.0721136343. The cubic root of 231620156 is about 614.1278368077.

Adding to 231620156 its reverse (651026132), we get a palindrome (882646288).

The spelling of 231620156 in words is "two hundred thirty-one million, six hundred twenty thousand, one hundred fifty-six".