313289981 has 4 divisors (see below), whose sum is σ = 316391964. Its totient is φ = 310188000.

The previous prime is 313289927. The next prime is 313289983. The reversal of 313289981 is 189982313.

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 240529081 + 72760900 = 15509^2 + 8530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313289981 is a prime.

It is a super-2 number, since 2×313289981² = 196301224389960722, 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 (313289983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550840 + ... + 1551041.

It is an arithmetic number, because the mean of its divisors is an integer number (79097991).

Almost surely, 2^313289981 is an apocalyptic number.

It is an amenable number.

313289981 is a deficient number, since it is larger than the sum of its proper divisors (3101983).

313289981 is a wasteful number, since it uses less digits than its factorization.

313289981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101982.

The product of its digits is 93312, while the sum is 44.

The square root of 313289981 is about 17699.9994632768. Note that the first 3 decimals coincide. The cubic root of 313289981 is about 679.1757465374.

The spelling of 313289981 in words is "three hundred thirteen million, two hundred eighty-nine thousand, nine hundred eighty-one".