161995937 has 2 divisors, whose sum is σ = 161995938. Its totient is φ = 161995936.

The previous prime is 161995927. The next prime is 161995949. The reversal of 161995937 is 739599161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155650576 + 6345361 = 12476^2 + 2519^2 .

It is a cyclic number.

It is not a de Polignac number, because 161995937 - 2⁸ = 161995681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161995927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80997968 + 80997969.

It is an arithmetic number, because the mean of its divisors is an integer number (80997969).

Almost surely, 2^161995937 is an apocalyptic number.

It is an amenable number.

161995937 is a deficient number, since it is larger than the sum of its proper divisors (1).

161995937 is an equidigital number, since it uses as much as digits as its factorization.

161995937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 459270, while the sum is 50.

The square root of 161995937 is about 12727.7624506431. The cubic root of 161995937 is about 545.1316204282.

The spelling of 161995937 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, nine hundred thirty-seven".