123131443251 has 4 divisors (see below), whose sum is σ = 164175257672. Its totient is φ = 82087628832.

The previous prime is 123131443243. The next prime is 123131443319. The reversal of 123131443251 is 152344131321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152344131321 = 3 ⋅50781377107.

It is not a de Polignac number, because 123131443251 - 2³ = 123131443243 is a prime.

It is a super-2 number, since 2×123131443251² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123131443231) 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 in 3 ways as a sum of consecutive naturals, for example, 20521907206 + ... + 20521907211.

It is an arithmetic number, because the mean of its divisors is an integer number (41043814418).

Almost surely, 2^123131443251 is an apocalyptic number.

123131443251 is a deficient number, since it is larger than the sum of its proper divisors (41043814421).

123131443251 is an equidigital number, since it uses as much as digits as its factorization.

123131443251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41043814420.

The product of its digits is 8640, while the sum is 30.

Adding to 123131443251 its reverse (152344131321), we get a palindrome (275475574572).

The spelling of 123131443251 in words is "one hundred twenty-three billion, one hundred thirty-one million, four hundred forty-three thousand, two hundred fifty-one".