161037399 has 4 divisors (see below), whose sum is σ = 214716536. Its totient is φ = 107358264.

The previous prime is 161037391. The next prime is 161037403. The reversal of 161037399 is 993730161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161037399 - 2³ = 161037391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161037391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26839564 + ... + 26839569.

It is an arithmetic number, because the mean of its divisors is an integer number (53679134).

Almost surely, 2^161037399 is an apocalyptic number.

161037399 is a deficient number, since it is larger than the sum of its proper divisors (53679137).

161037399 is an equidigital number, since it uses as much as digits as its factorization.

161037399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53679136.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 161037399 is about 12690.0511819299. The cubic root of 161037399 is about 544.0543024927.

The spelling of 161037399 in words is "one hundred sixty-one million, thirty-seven thousand, three hundred ninety-nine".