161593357 has 4 divisors (see below), whose sum is σ = 161834140. Its totient is φ = 161352576.

The previous prime is 161593351. The next prime is 161593409. The reversal of 161593357 is 753395161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753395161 = 241 ⋅3126121.

It can be written as a sum of positive squares in 2 ways, for example, as 126202756 + 35390601 = 11234^2 + 5949^2 .

It is a cyclic number.

It is not a de Polignac number, because 161593357 - 2²³ = 153204749 is a prime.

It is a super-2 number, since 2×161593357² = 52224826053058898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161593351) 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, 119382 + ... + 120727.

It is an arithmetic number, because the mean of its divisors is an integer number (40458535).

Almost surely, 2^161593357 is an apocalyptic number.

It is an amenable number.

161593357 is a deficient number, since it is larger than the sum of its proper divisors (240783).

161593357 is an equidigital number, since it uses as much as digits as its factorization.

161593357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240782.

The product of its digits is 85050, while the sum is 40.

The square root of 161593357 is about 12711.9375785126. The cubic root of 161593357 is about 544.6796726046.

The spelling of 161593357 in words is "one hundred sixty-one million, five hundred ninety-three thousand, three hundred fifty-seven".