313081861 has 4 divisors (see below), whose sum is σ = 313360300. Its totient is φ = 312803424.

The previous prime is 313081859. The next prime is 313081897. The reversal of 313081861 is 168180313.

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 25948836 + 287133025 = 5094^2 + 16945^2 .

It is a cyclic number.

It is not a de Polignac number, because 313081861 - 2¹ = 313081859 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 (313081831) 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, 137526 + ... + 139783.

It is an arithmetic number, because the mean of its divisors is an integer number (78340075).

Almost surely, 2^313081861 is an apocalyptic number.

It is an amenable number.

313081861 is a deficient number, since it is larger than the sum of its proper divisors (278439).

313081861 is a wasteful number, since it uses less digits than its factorization.

313081861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278438.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 313081861 is about 17694.1193903511. The cubic root of 313081861 is about 679.0253200142.

The spelling of 313081861 in words is "three hundred thirteen million, eighty-one thousand, eight hundred sixty-one".