161600389 has 4 divisors (see below), whose sum is σ = 162568224. Its totient is φ = 160632556.

The previous prime is 161600347. The next prime is 161600437. The reversal of 161600389 is 983006161.

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 161600389 - 2¹⁷ = 161469317 is a prime.

It is a super-2 number, since 2×161600389² = 52229371449902642, 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 (161601389) 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, 483667 + ... + 484000.

It is an arithmetic number, because the mean of its divisors is an integer number (40642056).

Almost surely, 2^161600389 is an apocalyptic number.

It is an amenable number.

161600389 is a deficient number, since it is larger than the sum of its proper divisors (967835).

161600389 is an equidigital number, since it uses as much as digits as its factorization.

161600389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967834.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 161600389 is about 12712.2141659115. The cubic root of 161600389 is about 544.6875733664.

The spelling of 161600389 in words is "one hundred sixty-one million, six hundred thousand, three hundred eighty-nine".