161607311 has 2 divisors, whose sum is σ = 161607312. Its totient is φ = 161607310.

The previous prime is 161607307. The next prime is 161607319. The reversal of 161607311 is 113706161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161607311 - 2² = 161607307 is a prime.

It is a super-2 number, since 2×161607311² = 52233845937301442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161607319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803655 + 80803656.

It is an arithmetic number, because the mean of its divisors is an integer number (80803656).

Almost surely, 2^161607311 is an apocalyptic number.

161607311 is a deficient number, since it is larger than the sum of its proper divisors (1).

161607311 is an equidigital number, since it uses as much as digits as its factorization.

161607311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 161607311 is about 12712.4864208384. The cubic root of 161607311 is about 544.6953503146.

The spelling of 161607311 in words is "one hundred sixty-one million, six hundred seven thousand, three hundred eleven".