161609039 has 2 divisors, whose sum is σ = 161609040. Its totient is φ = 161609038.

The previous prime is 161608999. The next prime is 161609059. The reversal of 161609039 is 930906161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161609039 is a prime.

It is a super-2 number, since 2×161609039² = 52234962973007042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161609059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80804519 + 80804520.

It is an arithmetic number, because the mean of its divisors is an integer number (80804520).

Almost surely, 2^161609039 is an apocalyptic number.

161609039 is a deficient number, since it is larger than the sum of its proper divisors (1).

161609039 is an equidigital number, since it uses as much as digits as its factorization.

161609039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 161609039 is about 12712.5543853311. The cubic root of 161609039 is about 544.6972917082.

The spelling of 161609039 in words is "one hundred sixty-one million, six hundred nine thousand, thirty-nine".