161440907 has 2 divisors, whose sum is σ = 161440908. Its totient is φ = 161440906.

The previous prime is 161440871. The next prime is 161440913. The reversal of 161440907 is 709044161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161440907 - 2⁶ = 161440843 is a prime.

It is not a weakly prime, because it can be changed into another prime (161440507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80720453 + 80720454.

It is an arithmetic number, because the mean of its divisors is an integer number (80720454).

Almost surely, 2^161440907 is an apocalyptic number.

161440907 is a deficient number, since it is larger than the sum of its proper divisors (1).

161440907 is an equidigital number, since it uses as much as digits as its factorization.

161440907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 161440907 is about 12705.9398314332. The cubic root of 161440907 is about 544.5083319340.

The spelling of 161440907 in words is "one hundred sixty-one million, four hundred forty thousand, nine hundred seven".