313805081 has 4 divisors (see below), whose sum is σ = 316912164. Its totient is φ = 310698000.

The previous prime is 313805047. The next prime is 313805087. The reversal of 313805081 is 180508313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 177289225 + 136515856 = 13315^2 + 11684^2 .

It is a cyclic number.

It is not a de Polignac number, because 313805081 - 2¹⁸ = 313542937 is a prime.

It is a super-2 number, since 2×313805081² = 196947257722833122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (313805087) 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, 1553390 + ... + 1553591.

It is an arithmetic number, because the mean of its divisors is an integer number (79228041).

Almost surely, 2^313805081 is an apocalyptic number.

It is an amenable number.

313805081 is a deficient number, since it is larger than the sum of its proper divisors (3107083).

313805081 is a wasteful number, since it uses less digits than its factorization.

313805081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107082.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 313805081 is about 17714.5443350937. The cubic root of 313805081 is about 679.5477680828.

The spelling of 313805081 in words is "three hundred thirteen million, eight hundred five thousand, eighty-one".