15131311122197 has 2 divisors, whose sum is σ = 15131311122198. Its totient is φ = 15131311122196.

The previous prime is 15131311122097. The next prime is 15131311122209. The reversal of 15131311122197 is 79122111313151.

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., 10897432867876 + 4233878254321 = 3301126^2 + 2057639^2 .

It is a cyclic number.

It is not a de Polignac number, because 15131311122197 - 2⁴² = 10733264611093 is a prime.

It is a super-2 number, since 2×15131311122197² (a number of 27 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 15131311122197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15131311122097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7565655561098 + 7565655561099.

It is an arithmetic number, because the mean of its divisors is an integer number (7565655561099).

Almost surely, 2^{15131311122197} is an apocalyptic number.

It is an amenable number.

15131311122197 is a deficient number, since it is larger than the sum of its proper divisors (1).

15131311122197 is an equidigital number, since it uses as much as digits as its factorization.

15131311122197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 38.

The spelling of 15131311122197 in words is "fifteen trillion, one hundred thirty-one billion, three hundred eleven million, one hundred twenty-two thousand, one hundred ninety-seven".