123451631 has 2 divisors, whose sum is σ = 123451632. Its totient is φ = 123451630.

The previous prime is 123451619. The next prime is 123451661. The reversal of 123451631 is 136154321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123451631 is a prime.

It is a super-2 number, since 2×123451631² = 30480610393120322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123451631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123451661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61725815 + 61725816.

It is an arithmetic number, because the mean of its divisors is an integer number (61725816).

Almost surely, 2^123451631 is an apocalyptic number.

123451631 is a deficient number, since it is larger than the sum of its proper divisors (1).

123451631 is an equidigital number, since it uses as much as digits as its factorization.

123451631 is an odious number, because the sum of its binary digits is odd.

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

The square root of 123451631 is about 11110.8789481301. The cubic root of 123451631 is about 497.9269245959.

The spelling of 123451631 in words is "one hundred twenty-three million, four hundred fifty-one thousand, six hundred thirty-one".