123031291 has 2 divisors, whose sum is σ = 123031292. Its totient is φ = 123031290.

The previous prime is 123031277. The next prime is 123031303. The reversal of 123031291 is 192130321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123031291 - 2⁹ = 123030779 is a prime.

It is not a weakly prime, because it can be changed into another prime (123031241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61515645 + 61515646.

It is an arithmetic number, because the mean of its divisors is an integer number (61515646).

Almost surely, 2^123031291 is an apocalyptic number.

123031291 is a deficient number, since it is larger than the sum of its proper divisors (1).

123031291 is an equidigital number, since it uses as much as digits as its factorization.

123031291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 123031291 is about 11091.9471239273. The cubic root of 123031291 is about 497.3611521314.

It can be divided in two parts, 12 and 3031291, that added together give a palindrome (3031303).

The spelling of 123031291 in words is "one hundred twenty-three million, thirty-one thousand, two hundred ninety-one".