6313981 has 4 divisors (see below), whose sum is σ = 6350652. Its totient is φ = 6277312.

The previous prime is 6313969. The next prime is 6313997. The reversal of 6313981 is 1893136.

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 6125625 + 188356 = 2475^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 6313981 - 2⁵ = 6313949 is a prime.

It is a super-2 number, since 2×6313981² = 79732712136722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6313921) 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, 18076 + ... + 18421.

It is an arithmetic number, because the mean of its divisors is an integer number (1587663).

Almost surely, 2^6313981 is an apocalyptic number.

It is an amenable number.

6313981 is a deficient number, since it is larger than the sum of its proper divisors (36671).

6313981 is a wasteful number, since it uses less digits than its factorization.

6313981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36670.

The product of its digits is 3888, while the sum is 31.

The square root of 6313981 is about 2512.7636180111. The cubic root of 6313981 is about 184.8279969358.

The spelling of 6313981 in words is "six million, three hundred thirteen thousand, nine hundred eighty-one".