123011031 has 64 divisors (see below), whose sum is σ = 207277056. Its totient is φ = 63744000.

The previous prime is 123011023. The next prime is 123011041. The reversal of 123011031 is 130110321.

It is not a de Polignac number, because 123011031 - 2³ = 123011023 is a prime.

It is a super-2 number, since 2×123011031² = 30263427495365922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123010998 and 123011016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123011041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 736510 + ... + 736676.

It is an arithmetic number, because the mean of its divisors is an integer number (3238704).

Almost surely, 2^123011031 is an apocalyptic number.

123011031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123011031 is a deficient number, since it is larger than the sum of its proper divisors (84266025).

123011031 is a wasteful number, since it uses less digits than its factorization.

123011031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 123011031 is about 11091.0338111467. The cubic root of 123011031 is about 497.3338498898. Note that the first 3 decimals are identical.

Adding to 123011031 its reverse (130110321), we get a palindrome (253121352).

It can be divided in two parts, 1 and 23011031, that added together give a palindrome (23011032).

The spelling of 123011031 in words is "one hundred twenty-three million, eleven thousand, thirty-one".