160997731 has 2 divisors, whose sum is σ = 160997732. Its totient is φ = 160997730.

The previous prime is 160997713. The next prime is 160997741. The reversal of 160997731 is 137799061.

Together with previous prime (160997713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 160997731 - 2⁵ = 160997699 is a prime.

It is a super-2 number, since 2×160997731² = 51840538774296722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (160997741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80498865 + 80498866.

It is an arithmetic number, because the mean of its divisors is an integer number (80498866).

Almost surely, 2^160997731 is an apocalyptic number.

160997731 is a deficient number, since it is larger than the sum of its proper divisors (1).

160997731 is an equidigital number, since it uses as much as digits as its factorization.

160997731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 160997731 is about 12688.4881290089. The cubic root of 160997731 is about 544.0096269112.

The spelling of 160997731 in words is "one hundred sixty million, nine hundred ninety-seven thousand, seven hundred thirty-one".