160807991 has 4 divisors (see below), whose sum is σ = 160889352. Its totient is φ = 160726632.

The previous prime is 160807951. The next prime is 160807993. The reversal of 160807991 is 199708061.

It is a happy number.

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 160807991 - 2¹⁴ = 160791607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160807993) 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, 37640 + ... + 41693.

It is an arithmetic number, because the mean of its divisors is an integer number (40222338).

Almost surely, 2^160807991 is an apocalyptic number.

160807991 is a deficient number, since it is larger than the sum of its proper divisors (81361).

160807991 is an equidigital number, since it uses as much as digits as its factorization.

160807991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81360.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 160807991 is about 12681.0090686822. The cubic root of 160807991 is about 543.7958330855.

The spelling of 160807991 in words is "one hundred sixty million, eight hundred seven thousand, nine hundred ninety-one".