161902907 has 2 divisors, whose sum is σ = 161902908. Its totient is φ = 161902906.

The previous prime is 161902879. The next prime is 161902931. The reversal of 161902907 is 709209161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161902907 - 2⁶ = 161902843 is a prime.

It is not a weakly prime, because it can be changed into another prime (161902607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80951453 + 80951454.

It is an arithmetic number, because the mean of its divisors is an integer number (80951454).

Almost surely, 2^161902907 is an apocalyptic number.

161902907 is a deficient number, since it is larger than the sum of its proper divisors (1).

161902907 is an equidigital number, since it uses as much as digits as its factorization.

161902907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 161902907 is about 12724.1073164289. The cubic root of 161902907 is about 545.0272488691.

The spelling of 161902907 in words is "one hundred sixty-one million, nine hundred two thousand, nine hundred seven".