161110639 has 2 divisors, whose sum is σ = 161110640. Its totient is φ = 161110638.

The previous prime is 161110603. The next prime is 161110657. The reversal of 161110639 is 936011161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161110639 - 2⁷ = 161110511 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161110739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80555319 + 80555320.

It is an arithmetic number, because the mean of its divisors is an integer number (80555320).

Almost surely, 2^161110639 is an apocalyptic number.

161110639 is a deficient number, since it is larger than the sum of its proper divisors (1).

161110639 is an equidigital number, since it uses as much as digits as its factorization.

161110639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 161110639 is about 12692.9365790584. The cubic root of 161110639 is about 544.1367688393.

The spelling of 161110639 in words is "one hundred sixty-one million, one hundred ten thousand, six hundred thirty-nine".