7128904631 has 2 divisors, whose sum is σ = 7128904632. Its totient is φ = 7128904630.

The previous prime is 7128904583. The next prime is 7128904697. The reversal of 7128904631 is 1364098217.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7128904631 is a prime.

It is a super-2 number, since 2×7128904631² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7128904931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564452315 + 3564452316.

It is an arithmetic number, because the mean of its divisors is an integer number (3564452316).

Almost surely, 2^7128904631 is an apocalyptic number.

7128904631 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128904631 is an equidigital number, since it uses as much as digits as its factorization.

7128904631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 7128904631 is about 84432.8409506633. The cubic root of 7128904631 is about 1924.6020096767.

The spelling of 7128904631 in words is "seven billion, one hundred twenty-eight million, nine hundred four thousand, six hundred thirty-one".