231213686 has 16 divisors (see below), whose sum is σ = 390555648. Its totient is φ = 101706600.

The previous prime is 231213683. The next prime is 231213691. The reversal of 231213686 is 686312132.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213683) 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, 168830 + ... + 170193.

It is an arithmetic number, because the mean of its divisors is an integer number (24409728).

Almost surely, 2^231213686 is an apocalyptic number.

231213686 is a deficient number, since it is larger than the sum of its proper divisors (159341962).

231213686 is a wasteful number, since it uses less digits than its factorization.

231213686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339067.

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

The square root of 231213686 is about 15205.7122819025. The cubic root of 231213686 is about 613.7683823304.

The spelling of 231213686 in words is "two hundred thirty-one million, two hundred thirteen thousand, six hundred eighty-six".