161131203587 has 2 divisors, whose sum is σ = 161131203588. Its totient is φ = 161131203586.

The previous prime is 161131203487. The next prime is 161131203671. The reversal of 161131203587 is 785302131161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161131203587 - 2²² = 161127009283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161131203587.

It is not a weakly prime, because it can be changed into another prime (161131203187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80565601793 + 80565601794.

It is an arithmetic number, because the mean of its divisors is an integer number (80565601794).

Almost surely, 2^161131203587 is an apocalyptic number.

161131203587 is a deficient number, since it is larger than the sum of its proper divisors (1).

161131203587 is an equidigital number, since it uses as much as digits as its factorization.

161131203587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 161131203587 in words is "one hundred sixty-one billion, one hundred thirty-one million, two hundred three thousand, five hundred eighty-seven".