123117152491 has 2 divisors, whose sum is σ = 123117152492. Its totient is φ = 123117152490.

The previous prime is 123117152467. The next prime is 123117152507. The reversal of 123117152491 is 194251711321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123117152491 - 2³¹ = 120969668843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123117152491.

It is not a weakly prime, because it can be changed into another prime (123117152401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61558576245 + 61558576246.

It is an arithmetic number, because the mean of its divisors is an integer number (61558576246).

Almost surely, 2^123117152491 is an apocalyptic number.

123117152491 is a deficient number, since it is larger than the sum of its proper divisors (1).

123117152491 is an equidigital number, since it uses as much as digits as its factorization.

123117152491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The spelling of 123117152491 in words is "one hundred twenty-three billion, one hundred seventeen million, one hundred fifty-two thousand, four hundred ninety-one".