160515991 has 4 divisors (see below), whose sum is σ = 160542184. Its totient is φ = 160489800.

The previous prime is 160515983. The next prime is 160515997. The reversal of 160515991 is 199515061.

160515991 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, and also an emirpimes, since its reverse is a distinct semiprime: 199515061 = 41 ⋅4866221.

It is a cyclic number.

It is not a de Polignac number, because 160515991 - 2³ = 160515983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 160515991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160515997) 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, 1576 + ... + 17986.

It is an arithmetic number, because the mean of its divisors is an integer number (40135546).

Almost surely, 2^160515991 is an apocalyptic number.

160515991 is a deficient number, since it is larger than the sum of its proper divisors (26193).

160515991 is an equidigital number, since it uses as much as digits as its factorization.

160515991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26192.

The product of its (nonzero) digits is 12150, while the sum is 37.

The square root of 160515991 is about 12669.4905580296. The cubic root of 160515991 is about 543.4664867012.

The spelling of 160515991 in words is "one hundred sixty million, five hundred fifteen thousand, nine hundred ninety-one".