161129598731 has 2 divisors, whose sum is σ = 161129598732. Its totient is φ = 161129598730.

The previous prime is 161129598727. The next prime is 161129598737. The reversal of 161129598731 is 137895921161.

It is a weak prime.

It is an emirp because it is prime and its reverse (137895921161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161129598731 - 2² = 161129598727 is a prime.

It is a super-2 number, since 2×161129598731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161129598737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80564799365 + 80564799366.

It is an arithmetic number, because the mean of its divisors is an integer number (80564799366).

Almost surely, 2^161129598731 is an apocalyptic number.

161129598731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161129598731 is an equidigital number, since it uses as much as digits as its factorization.

161129598731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 53.

The spelling of 161129598731 in words is "one hundred sixty-one billion, one hundred twenty-nine million, five hundred ninety-eight thousand, seven hundred thirty-one".