123131131 has 2 divisors, whose sum is σ = 123131132. Its totient is φ = 123131130.

The previous prime is 123131093. The next prime is 123131143. The reversal of 123131131 is 131131321.

It is a strong prime.

It is an emirp because it is prime and its reverse (131131321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123131131 - 2¹⁹ = 122606843 is a prime.

It is a super-2 number, since 2×123131131² = 30322550842678322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123131531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565565 + 61565566.

It is an arithmetic number, because the mean of its divisors is an integer number (61565566).

Almost surely, 2^123131131 is an apocalyptic number.

123131131 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131131 is an equidigital number, since it uses as much as digits as its factorization.

123131131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 16.

The square root of 123131131 is about 11096.4467736298. The cubic root of 123131131 is about 497.4956520920.

Adding to 123131131 its reverse (131131321), we get a palindrome (254262452).

It can be divided in two parts, 12313 and 1131, that multiplied together give a triangular number (13926003 = T₅₂₇₇).

The spelling of 123131131 in words is "one hundred twenty-three million, one hundred thirty-one thousand, one hundred thirty-one".