161623293 has 16 divisors (see below), whose sum is σ = 240078720. Its totient is φ = 96030144.

The previous prime is 161623249. The next prime is 161623307. The reversal of 161623293 is 392326161.

It is not a de Polignac number, because 161623293 - 2⁹ = 161622781 is a prime.

It is a super-2 number, since 2×161623293² = 52244177680327698, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161623793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70321 + ... + 72582.

It is an arithmetic number, because the mean of its divisors is an integer number (15004920).

Almost surely, 2^161623293 is an apocalyptic number.

161623293 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161623293 is a deficient number, since it is larger than the sum of its proper divisors (78455427).

161623293 is a wasteful number, since it uses less digits than its factorization.

161623293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142948.

The product of its digits is 11664, while the sum is 33.

The square root of 161623293 is about 12713.1149998732. The cubic root of 161623293 is about 544.7133054308.

The spelling of 161623293 in words is "one hundred sixty-one million, six hundred twenty-three thousand, two hundred ninety-three".