313661563 has 4 divisors (see below), whose sum is σ = 315043560. Its totient is φ = 312279568.

The previous prime is 313661533. The next prime is 313661581. The reversal of 313661563 is 365166313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365166313 = 61 ⋅5986333.

It is a cyclic number.

It is not a de Polignac number, because 313661563 - 2²¹ = 311564411 is a prime.

It is a super-2 number, since 2×313661563² = 196767152207205938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313661533) 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, 690658 + ... + 691111.

It is an arithmetic number, because the mean of its divisors is an integer number (78760890).

Almost surely, 2^313661563 is an apocalyptic number.

313661563 is a deficient number, since it is larger than the sum of its proper divisors (1381997).

313661563 is a wasteful number, since it uses less digits than its factorization.

313661563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381996.

The product of its digits is 29160, while the sum is 34.

The square root of 313661563 is about 17710.4930196762. The cubic root of 313661563 is about 679.4441557725. Note that the first 3 decimals are identical.

The spelling of 313661563 in words is "three hundred thirteen million, six hundred sixty-one thousand, five hundred sixty-three".