161691707 has 2 divisors, whose sum is σ = 161691708. Its totient is φ = 161691706.

The previous prime is 161691697. The next prime is 161691713. The reversal of 161691707 is 707196161.

161691707 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 a cyclic number.

It is not a de Polignac number, because 161691707 - 2⁶ = 161691643 is a prime.

It is a super-2 number, since 2×161691707² = 52288416225147698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161691787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80845853 + 80845854.

It is an arithmetic number, because the mean of its divisors is an integer number (80845854).

Almost surely, 2^161691707 is an apocalyptic number.

161691707 is a deficient number, since it is larger than the sum of its proper divisors (1).

161691707 is an equidigital number, since it uses as much as digits as its factorization.

161691707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 161691707 is about 12715.8054011533. The cubic root of 161691707 is about 544.7901523557.

The spelling of 161691707 in words is "one hundred sixty-one million, six hundred ninety-one thousand, seven hundred seven".