161939707 has 2 divisors, whose sum is σ = 161939708. Its totient is φ = 161939706.

The previous prime is 161939681. The next prime is 161939731. The reversal of 161939707 is 707939161.

161939707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (707939161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161939707 - 2²⁷ = 27721979 is a prime.

It is not a weakly prime, because it can be changed into another prime (161939777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80969853 + 80969854.

It is an arithmetic number, because the mean of its divisors is an integer number (80969854).

Almost surely, 2^161939707 is an apocalyptic number.

161939707 is a deficient number, since it is larger than the sum of its proper divisors (1).

161939707 is an equidigital number, since it uses as much as digits as its factorization.

161939707 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 161939707 is about 12725.5533082063. The cubic root of 161939707 is about 545.0685400431.

The spelling of 161939707 in words is "one hundred sixty-one million, nine hundred thirty-nine thousand, seven hundred seven".