11815172497 has 2 divisors, whose sum is σ = 11815172498. Its totient is φ = 11815172496.

The previous prime is 11815172491. The next prime is 11815172513. The reversal of 11815172497 is 79427151811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6423060736 + 5392111761 = 80144^2 + 73431^2 .

It is a cyclic number.

It is not a de Polignac number, because 11815172497 - 2¹⁵ = 11815139729 is a prime.

It is a super-2 number, since 2×11815172497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11815172491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907586248 + 5907586249.

It is an arithmetic number, because the mean of its divisors is an integer number (5907586249).

Almost surely, 2^11815172497 is an apocalyptic number.

It is an amenable number.

11815172497 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815172497 is an equidigital number, since it uses as much as digits as its factorization.

11815172497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The spelling of 11815172497 in words is "eleven billion, eight hundred fifteen million, one hundred seventy-two thousand, four hundred ninety-seven".