161913323 has 24 divisors (see below), whose sum is σ = 192580416. Its totient is φ = 134940000.

The previous prime is 161913319. The next prime is 161913359. The reversal of 161913323 is 323319161.

It is not a de Polignac number, because 161913323 - 2² = 161913319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161913373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 466436 + ... + 466782.

It is an arithmetic number, because the mean of its divisors is an integer number (8024184).

Almost surely, 2^161913323 is an apocalyptic number.

161913323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161913323 is a deficient number, since it is larger than the sum of its proper divisors (30667093).

161913323 is a wasteful number, since it uses less digits than its factorization.

161913323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 622 counting only the distinct ones).

The product of its digits is 2916, while the sum is 29.

The square root of 161913323 is about 12724.5166116438. The cubic root of 161913323 is about 545.0389367014.

The spelling of 161913323 in words is "one hundred sixty-one million, nine hundred thirteen thousand, three hundred twenty-three".