121992631493 has 2 divisors, whose sum is σ = 121992631494. Its totient is φ = 121992631492.

The previous prime is 121992631489. The next prime is 121992631571. The reversal of 121992631493 is 394136299121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97920178084 + 24072453409 = 312922^2 + 155153^2 .

It is a cyclic number.

It is not a de Polignac number, because 121992631493 - 2² = 121992631489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121992631403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60996315746 + 60996315747.

It is an arithmetic number, because the mean of its divisors is an integer number (60996315747).

Almost surely, 2^121992631493 is an apocalyptic number.

It is an amenable number.

121992631493 is a deficient number, since it is larger than the sum of its proper divisors (1).

121992631493 is an equidigital number, since it uses as much as digits as its factorization.

121992631493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The spelling of 121992631493 in words is "one hundred twenty-one billion, nine hundred ninety-two million, six hundred thirty-one thousand, four hundred ninety-three".