19457331917 has 2 divisors, whose sum is σ = 19457331918. Its totient is φ = 19457331916.

The previous prime is 19457331899. The next prime is 19457331967. The reversal of 19457331917 is 71913375491.

It is an a-pointer prime, because the next prime (19457331967) can be obtained adding 19457331917 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10969210756 + 8488121161 = 104734^2 + 92131^2 .

It is a cyclic number.

It is not a de Polignac number, because 19457331917 - 2⁶ = 19457331853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19457331967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9728665958 + 9728665959.

It is an arithmetic number, because the mean of its divisors is an integer number (9728665959).

Almost surely, 2^19457331917 is an apocalyptic number.

It is an amenable number.

19457331917 is a deficient number, since it is larger than the sum of its proper divisors (1).

19457331917 is an equidigital number, since it uses as much as digits as its factorization.

19457331917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 50.

The spelling of 19457331917 in words is "nineteen billion, four hundred fifty-seven million, three hundred thirty-one thousand, nine hundred seventeen".