161373617 has 2 divisors, whose sum is σ = 161373618. Its totient is φ = 161373616.

The previous prime is 161373599. The next prime is 161373647. The reversal of 161373617 is 716373161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131079601 + 30294016 = 11449^2 + 5504^2 .

It is a cyclic number.

It is not a de Polignac number, because 161373617 - 2¹² = 161369521 is a prime.

It is not a weakly prime, because it can be changed into another prime (161373647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80686808 + 80686809.

It is an arithmetic number, because the mean of its divisors is an integer number (80686809).

Almost surely, 2^161373617 is an apocalyptic number.

It is an amenable number.

161373617 is a deficient number, since it is larger than the sum of its proper divisors (1).

161373617 is an equidigital number, since it uses as much as digits as its factorization.

161373617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 161373617 is about 12703.2915813186. The cubic root of 161373617 is about 544.4326694555.

The spelling of 161373617 in words is "one hundred sixty-one million, three hundred seventy-three thousand, six hundred seventeen".