123686831 has 2 divisors, whose sum is σ = 123686832. Its totient is φ = 123686830.

The previous prime is 123686821. The next prime is 123686867. The reversal of 123686831 is 138686321.

It is a weak prime.

It is an emirp because it is prime and its reverse (138686321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123686831 - 2⁶ = 123686767 is a prime.

It is a super-2 number, since 2×123686831² = 30596864325645122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123686821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61843415 + 61843416.

It is an arithmetic number, because the mean of its divisors is an integer number (61843416).

Almost surely, 2^123686831 is an apocalyptic number.

123686831 is a deficient number, since it is larger than the sum of its proper divisors (1).

123686831 is an equidigital number, since it uses as much as digits as its factorization.

123686831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 123686831 is about 11121.4581328169. The cubic root of 123686831 is about 498.2429407180.

The spelling of 123686831 in words is "one hundred twenty-three million, six hundred eighty-six thousand, eight hundred thirty-one".