161776031 has 2 divisors, whose sum is σ = 161776032. Its totient is φ = 161776030.

The previous prime is 161776009. The next prime is 161776057. The reversal of 161776031 is 130677161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161776031 - 2⁶ = 161775967 is a prime.

It is a super-2 number, since 2×161776031² = 52342968412225922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161776001) 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, 80888015 + 80888016.

It is an arithmetic number, because the mean of its divisors is an integer number (80888016).

Almost surely, 2^161776031 is an apocalyptic number.

161776031 is a deficient number, since it is larger than the sum of its proper divisors (1).

161776031 is an equidigital number, since it uses as much as digits as its factorization.

161776031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 161776031 is about 12719.1206850159. The cubic root of 161776031 is about 544.8848405787.

The spelling of 161776031 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, thirty-one".