123313031 has 4 divisors (see below), whose sum is σ = 125153592. Its totient is φ = 121472472.

The previous prime is 123313027. The next prime is 123313049. The reversal of 123313031 is 130313321.

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 123313031 - 2² = 123313027 is a prime.

It is a super-2 number, since 2×123313031² = 30412207228813922, 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 (123313061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920180 + ... + 920313.

It is an arithmetic number, because the mean of its divisors is an integer number (31288398).

Almost surely, 2^123313031 is an apocalyptic number.

123313031 is a deficient number, since it is larger than the sum of its proper divisors (1840561).

123313031 is an equidigital number, since it uses as much as digits as its factorization.

123313031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840560.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 123313031 is about 11104.6400662066. The cubic root of 123313031 is about 497.7405128158.

Adding to 123313031 its reverse (130313321), we get a palindrome (253626352).

The spelling of 123313031 in words is "one hundred twenty-three million, three hundred thirteen thousand, thirty-one".