15691115137 has 2 divisors, whose sum is σ = 15691115138. Its totient is φ = 15691115136.

The previous prime is 15691115117. The next prime is 15691115171. The reversal of 15691115137 is 73151119651.

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., 13118495296 + 2572619841 = 114536^2 + 50721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15691115137 is a prime.

It is a super-2 number, since 2×15691115137² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15691115137.

It is not a weakly prime, because it can be changed into another prime (15691115117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845557568 + 7845557569.

It is an arithmetic number, because the mean of its divisors is an integer number (7845557569).

Almost surely, 2^15691115137 is an apocalyptic number.

It is an amenable number.

15691115137 is a deficient number, since it is larger than the sum of its proper divisors (1).

15691115137 is an equidigital number, since it uses as much as digits as its factorization.

15691115137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 40.

The spelling of 15691115137 in words is "fifteen billion, six hundred ninety-one million, one hundred fifteen thousand, one hundred thirty-seven".