161235005131 has 2 divisors, whose sum is σ = 161235005132. Its totient is φ = 161235005130.

The previous prime is 161235005093. The next prime is 161235005137. The reversal of 161235005131 is 131500532161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161235005131 - 2³⁷ = 23796051659 is a prime.

It is a super-2 number, since 2×161235005131² (a number of 23 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 161235005131.

It is not a weakly prime, because it can be changed into another prime (161235005137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617502565 + 80617502566.

It is an arithmetic number, because the mean of its divisors is an integer number (80617502566).

Almost surely, 2^161235005131 is an apocalyptic number.

161235005131 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235005131 is an equidigital number, since it uses as much as digits as its factorization.

161235005131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

Adding to 161235005131 its reverse (131500532161), we get a palindrome (292735537292).

The spelling of 161235005131 in words is "one hundred sixty-one billion, two hundred thirty-five million, five thousand, one hundred thirty-one".