161456731 has 2 divisors, whose sum is σ = 161456732. Its totient is φ = 161456730.

The previous prime is 161456719. The next prime is 161456741. The reversal of 161456731 is 137654161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161456731 - 2⁹ = 161456219 is a prime.

It is a super-2 number, since 2×161456731² = 52136551970412722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161456741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80728365 + 80728366.

It is an arithmetic number, because the mean of its divisors is an integer number (80728366).

Almost surely, 2^161456731 is an apocalyptic number.

161456731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161456731 is an equidigital number, since it uses as much as digits as its factorization.

161456731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 161456731 is about 12706.5625170618. The cubic root of 161456731 is about 544.5261217629.

The spelling of 161456731 in words is "one hundred sixty-one million, four hundred fifty-six thousand, seven hundred thirty-one".