123251131 has 4 divisors (see below), whose sum is σ = 127501200. Its totient is φ = 119001064.

The previous prime is 123251113. The next prime is 123251137. The reversal of 123251131 is 131152321.

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 123251131 - 2¹¹ = 123249083 is a prime.

It is a super-2 number, since 2×123251131² = 30381682585558322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123251099 and 123251108.

It is not an unprimeable number, because it can be changed into a prime (123251137) 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, 2124991 + ... + 2125048.

It is an arithmetic number, because the mean of its divisors is an integer number (31875300).

Almost surely, 2^123251131 is an apocalyptic number.

123251131 is a deficient number, since it is larger than the sum of its proper divisors (4250069).

123251131 is an equidigital number, since it uses as much as digits as its factorization.

123251131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250068.

The product of its digits is 180, while the sum is 19.

The square root of 123251131 is about 11101.8525931486. The cubic root of 123251131 is about 497.6572145240.

It can be divided in two parts, 12325 and 1131, that added together give a square (13456 = 116²).

The spelling of 123251131 in words is "one hundred twenty-three million, two hundred fifty-one thousand, one hundred thirty-one".