19413126961 has 2 divisors, whose sum is σ = 19413126962. Its totient is φ = 19413126960.

The previous prime is 19413126949. The next prime is 19413126991. The reversal of 19413126961 is 16962131491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17420040225 + 1993086736 = 131985^2 + 44644^2 .

It is a cyclic number.

It is not a de Polignac number, because 19413126961 - 2⁷ = 19413126833 is a prime.

It is not a weakly prime, because it can be changed into another prime (19413126911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9706563480 + 9706563481.

It is an arithmetic number, because the mean of its divisors is an integer number (9706563481).

Almost surely, 2^19413126961 is an apocalyptic number.

It is an amenable number.

19413126961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19413126961 is an equidigital number, since it uses as much as digits as its factorization.

19413126961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The spelling of 19413126961 in words is "nineteen billion, four hundred thirteen million, one hundred twenty-six thousand, nine hundred sixty-one".