3113478721 has 2 divisors, whose sum is σ = 3113478722. Its totient is φ = 3113478720.

The previous prime is 3113478713. The next prime is 3113478727. The reversal of 3113478721 is 1278743113.

It is a happy number.

3113478721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2999095696 + 114383025 = 54764^2 + 10695^2 .

It is a cyclic number.

It is not a de Polignac number, because 3113478721 - 2³ = 3113478713 is a prime.

It is a super-2 number, since 2×3113478721² = 19387499492239591682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3113478727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556739360 + 1556739361.

It is an arithmetic number, because the mean of its divisors is an integer number (1556739361).

Almost surely, 2^3113478721 is an apocalyptic number.

It is an amenable number.

3113478721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3113478721 is an equidigital number, since it uses as much as digits as its factorization.

3113478721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 3113478721 is about 55798.5548289559. The cubic root of 3113478721 is about 1460.2099405677.

The spelling of 3113478721 in words is "three billion, one hundred thirteen million, four hundred seventy-eight thousand, seven hundred twenty-one".