123240631 has 4 divisors (see below), whose sum is σ = 129727000. Its totient is φ = 116754264.

The previous prime is 123240619. The next prime is 123240653. The reversal of 123240631 is 136042321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123240631 - 2⁹ = 123240119 is a prime.

It is a super-2 number, since 2×123240631² = 30376506258556322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123240331) 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 3 ways as a sum of consecutive naturals, for example, 3243156 + ... + 3243193.

It is an arithmetic number, because the mean of its divisors is an integer number (32431750).

Almost surely, 2^123240631 is an apocalyptic number.

123240631 is a deficient number, since it is larger than the sum of its proper divisors (6486369).

123240631 is an equidigital number, since it uses as much as digits as its factorization.

123240631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486368.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 123240631 is about 11101.3796890296. The cubic root of 123240631 is about 497.6430819988.

Adding to 123240631 its reverse (136042321), we get a palindrome (259282952).

The spelling of 123240631 in words is "one hundred twenty-three million, two hundred forty thousand, six hundred thirty-one".