19415887913 has 2 divisors, whose sum is σ = 19415887914. Its totient is φ = 19415887912.

The previous prime is 19415887837. The next prime is 19415887937. The reversal of 19415887913 is 31978851491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15618000784 + 3797887129 = 124972^2 + 61627^2 .

It is a cyclic number.

It is not a de Polignac number, because 19415887913 - 2¹⁸ = 19415625769 is a prime.

It is not a weakly prime, because it can be changed into another prime (19415887313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9707943956 + 9707943957.

It is an arithmetic number, because the mean of its divisors is an integer number (9707943957).

Almost surely, 2^19415887913 is an apocalyptic number.

It is an amenable number.

19415887913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19415887913 is an equidigital number, since it uses as much as digits as its factorization.

19415887913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 56.

The spelling of 19415887913 in words is "nineteen billion, four hundred fifteen million, eight hundred eighty-seven thousand, nine hundred thirteen".