161593399 has 4 divisors (see below), whose sum is σ = 176283720. Its totient is φ = 146903080.

The previous prime is 161593351. The next prime is 161593409. The reversal of 161593399 is 993395161.

161593399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161593399 - 2⁹ = 161592887 is a prime.

It is a super-2 number, since 2×161593399² = 52224853200746402, 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 (161543399) 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, 7345144 + ... + 7345165.

It is an arithmetic number, because the mean of its divisors is an integer number (44070930).

Almost surely, 2^161593399 is an apocalyptic number.

161593399 is a deficient number, since it is larger than the sum of its proper divisors (14690321).

161593399 is a wasteful number, since it uses less digits than its factorization.

161593399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14690320.

The product of its digits is 196830, while the sum is 46.

The square root of 161593399 is about 12711.9392305030. The cubic root of 161593399 is about 544.6797197941.

The spelling of 161593399 in words is "one hundred sixty-one million, five hundred ninety-three thousand, three hundred ninety-nine".