123215631 has 24 divisors (see below), whose sum is σ = 206381952. Its totient is φ = 64006800.

The previous prime is 123215629. The next prime is 123215633. The reversal of 123215631 is 136512321.

It is an interprime number because it is at equal distance from previous prime (123215629) and next prime (123215633).

It is not a de Polignac number, because 123215631 - 2¹ = 123215629 is a prime.

It is a super-2 number, since 2×123215631² = 30364183445456322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123215633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21705 + ... + 26786.

It is an arithmetic number, because the mean of its divisors is an integer number (8599248).

Almost surely, 2^123215631 is an apocalyptic number.

123215631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123215631 is a deficient number, since it is larger than the sum of its proper divisors (83166321).

123215631 is a wasteful number, since it uses less digits than its factorization.

123215631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48523 (or 48512 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 123215631 is about 11100.2536457506. The cubic root of 123215631 is about 497.6094298981.

Adding to 123215631 its reverse (136512321), we get a palindrome (259727952).

The spelling of 123215631 in words is "one hundred twenty-three million, two hundred fifteen thousand, six hundred thirty-one".