313161891 has 24 divisors (see below), whose sum is σ = 486581184. Its totient is φ = 178632720.

The previous prime is 313161887. The next prime is 313161917. The reversal of 313161891 is 198161313.

It is a happy number.

It is not a de Polignac number, because 313161891 - 2² = 313161887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (313161841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100036 + ... + 103118.

It is an arithmetic number, because the mean of its divisors is an integer number (20274216).

Almost surely, 2^313161891 is an apocalyptic number.

313161891 is a deficient number, since it is larger than the sum of its proper divisors (173419293).

313161891 is a wasteful number, since it uses less digits than its factorization.

313161891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791 (or 3784 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 313161891 is about 17696.3807316637. The cubic root of 313161891 is about 679.0831725798.

The spelling of 313161891 in words is "three hundred thirteen million, one hundred sixty-one thousand, eight hundred ninety-one".