16131651121 has 2 divisors, whose sum is σ = 16131651122. Its totient is φ = 16131651120.

The previous prime is 16131651103. The next prime is 16131651161. The reversal of 16131651121 is 12115613161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10740420496 + 5391230625 = 103636^2 + 73425^2 .

It is a cyclic number.

It is not a de Polignac number, because 16131651121 - 2⁵ = 16131651089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16131651121.

It is not a weakly prime, because it can be changed into another prime (16131651161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8065825560 + 8065825561.

It is an arithmetic number, because the mean of its divisors is an integer number (8065825561).

Almost surely, 2^16131651121 is an apocalyptic number.

It is an amenable number.

16131651121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16131651121 is an equidigital number, since it uses as much as digits as its factorization.

16131651121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The spelling of 16131651121 in words is "sixteen billion, one hundred thirty-one million, six hundred fifty-one thousand, one hundred twenty-one".