123611604491 has 2 divisors, whose sum is σ = 123611604492. Its totient is φ = 123611604490.

The previous prime is 123611604463. The next prime is 123611604521. The reversal of 123611604491 is 194406116321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123611604491 is a prime.

It is a super-2 number, since 2×123611604491² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (123611604091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61805802245 + 61805802246.

It is an arithmetic number, because the mean of its divisors is an integer number (61805802246).

Almost surely, 2^123611604491 is an apocalyptic number.

123611604491 is a deficient number, since it is larger than the sum of its proper divisors (1).

123611604491 is an equidigital number, since it uses as much as digits as its factorization.

123611604491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 123611604491 in words is "one hundred twenty-three billion, six hundred eleven million, six hundred four thousand, four hundred ninety-one".