123631 has 2 divisors, whose sum is σ = 123632. Its totient is φ = 123630.

The previous prime is 123619. The next prime is 123637. The reversal of 123631 is 136321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123631 - 2⁷ = 123503 is a prime.

It is a super-2 number, since 2×123631² = 30569248322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61815 + 61816.

It is an arithmetic number, because the mean of its divisors is an integer number (61816).

2¹²³⁶³¹ is an apocalyptic number.

123631 is a deficient number, since it is larger than the sum of its proper divisors (1).

123631 is an equidigital number, since it uses as much as digits as its factorization.

123631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 16.

The square root of 123631 is about 351.6120020705. The cubic root of 123631 is about 49.8167962140.

Adding to 123631 its reverse (136321), we get a palindrome (259952).

It can be divided in two parts, 1 and 23631, that added together give a palindrome (23632).

The spelling of 123631 in words is "one hundred twenty-three thousand, six hundred thirty-one".