161890793 has 4 divisors (see below), whose sum is σ = 162488448. Its totient is φ = 161293140.

The previous prime is 161890783. The next prime is 161890801. The reversal of 161890793 is 397098161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161890793 - 2⁴ = 161890777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161890783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298421 + ... + 298962.

It is an arithmetic number, because the mean of its divisors is an integer number (40622112).

Almost surely, 2^161890793 is an apocalyptic number.

It is an amenable number.

161890793 is a deficient number, since it is larger than the sum of its proper divisors (597655).

161890793 is an equidigital number, since it uses as much as digits as its factorization.

161890793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597654.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 161890793 is about 12723.6312819886. The cubic root of 161890793 is about 545.0136550741.

The spelling of 161890793 in words is "one hundred sixty-one million, eight hundred ninety thousand, seven hundred ninety-three".