15871850331121 has 2 divisors, whose sum is σ = 15871850331122. Its totient is φ = 15871850331120.

The previous prime is 15871850331017. The next prime is 15871850331133. The reversal of 15871850331121 is 12113305817851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15865563585600 + 6286745521 = 3983160^2 + 79289^2 .

It is a cyclic number.

It is not a de Polignac number, because 15871850331121 - 2³¹ = 15869702847473 is a prime.

It is a super-2 number, since 2×15871850331121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15871850331151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7935925165560 + 7935925165561.

It is an arithmetic number, because the mean of its divisors is an integer number (7935925165561).

Almost surely, 2^{15871850331121} is an apocalyptic number.

It is an amenable number.

15871850331121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15871850331121 is an equidigital number, since it uses as much as digits as its factorization.

15871850331121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 15871850331121 in words is "fifteen trillion, eight hundred seventy-one billion, eight hundred fifty million, three hundred thirty-one thousand, one hundred twenty-one".