9951315813 has 6 divisors (see below), whose sum is σ = 14374122854. Its totient is φ = 6634210536.

The previous prime is 9951315763. The next prime is 9951315821. The reversal of 9951315813 is 3185131599.

It can be written as a sum of positive squares in only one way, i.e., 8722252449 + 1229063364 = 93393^2 + 35058^2 .

It is not a de Polignac number, because 9951315813 - 2¹⁷ = 9951184741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9951315883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552850870 + ... + 552850887.

Almost surely, 2^9951315813 is an apocalyptic number.

It is an amenable number.

9951315813 is a deficient number, since it is larger than the sum of its proper divisors (4422807041).

9951315813 is a wasteful number, since it uses less digits than its factorization.

9951315813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105701763 (or 1105701760 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 9951315813 is about 99756.2820728600. The cubic root of 9951315813 is about 2150.9327708882.

The spelling of 9951315813 in words is "nine billion, nine hundred fifty-one million, three hundred fifteen thousand, eight hundred thirteen".