161790439 has 2 divisors, whose sum is σ = 161790440. Its totient is φ = 161790438.

The previous prime is 161790413. The next prime is 161790451. The reversal of 161790439 is 934097161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161790439 - 2⁵ = 161790407 is a prime.

It is a super-2 number, since 2×161790439² = 52352292303625442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161790539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80895219 + 80895220.

It is an arithmetic number, because the mean of its divisors is an integer number (80895220).

Almost surely, 2^161790439 is an apocalyptic number.

161790439 is a deficient number, since it is larger than the sum of its proper divisors (1).

161790439 is an equidigital number, since it uses as much as digits as its factorization.

161790439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 161790439 is about 12719.6870637606. The cubic root of 161790439 is about 544.9010161676.

The spelling of 161790439 in words is "one hundred sixty-one million, seven hundred ninety thousand, four hundred thirty-nine".