313345661 has 4 divisors (see below), whose sum is σ = 313549500. Its totient is φ = 313141824.

The previous prime is 313345621. The next prime is 313345693. The reversal of 313345661 is 166543313.

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 66667225 + 246678436 = 8165^2 + 15706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313345661 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 (313345621) 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, 99596 + ... + 102693.

It is an arithmetic number, because the mean of its divisors is an integer number (78387375).

Almost surely, 2^313345661 is an apocalyptic number.

It is an amenable number.

313345661 is a deficient number, since it is larger than the sum of its proper divisors (203839).

313345661 is a wasteful number, since it uses less digits than its factorization.

313345661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203838.

The product of its digits is 19440, while the sum is 32.

The square root of 313345661 is about 17701.5722748009. The cubic root of 313345661 is about 679.2159800460.

Adding to 313345661 its reverse (166543313), we get a palindrome (479888974).

The spelling of 313345661 in words is "three hundred thirteen million, three hundred forty-five thousand, six hundred sixty-one".