15091968971 has 2 divisors, whose sum is σ = 15091968972. Its totient is φ = 15091968970.

The previous prime is 15091968937. The next prime is 15091969003. The reversal of 15091968971 is 17986919051.

It is a strong prime.

It is an emirp because it is prime and its reverse (17986919051) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15091968971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15091968901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7545984485 + 7545984486.

It is an arithmetic number, because the mean of its divisors is an integer number (7545984486).

Almost surely, 2^15091968971 is an apocalyptic number.

15091968971 is a deficient number, since it is larger than the sum of its proper divisors (1).

15091968971 is an equidigital number, since it uses as much as digits as its factorization.

15091968971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 56.

The spelling of 15091968971 in words is "fifteen billion, ninety-one million, nine hundred sixty-eight thousand, nine hundred seventy-one".