19609240913 has 2 divisors, whose sum is σ = 19609240914. Its totient is φ = 19609240912.

The previous prime is 19609240907. The next prime is 19609240921. The reversal of 19609240913 is 31904290691.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19148194129 + 461046784 = 138377^2 + 21472^2 .

It is a cyclic number.

It is not a de Polignac number, because 19609240913 - 2⁴ = 19609240897 is a prime.

It is not a weakly prime, because it can be changed into another prime (19609240993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9804620456 + 9804620457.

It is an arithmetic number, because the mean of its divisors is an integer number (9804620457).

Almost surely, 2^19609240913 is an apocalyptic number.

It is an amenable number.

19609240913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19609240913 is an equidigital number, since it uses as much as digits as its factorization.

19609240913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The spelling of 19609240913 in words is "nineteen billion, six hundred nine million, two hundred forty thousand, nine hundred thirteen".