5121951313 has 4 divisors (see below), whose sum is σ = 5122157040. Its totient is φ = 5121745588.

The previous prime is 5121951271. The next prime is 5121951343. The reversal of 5121951313 is 3131591215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3131591215 = 5 ⋅626318243.

It is a cyclic number.

It is not a de Polignac number, because 5121951313 - 2¹⁷ = 5121820241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5121951343) 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, 59395 + ... + 117352.

It is an arithmetic number, because the mean of its divisors is an integer number (1280539260).

Almost surely, 2^5121951313 is an apocalyptic number.

It is an amenable number.

5121951313 is a deficient number, since it is larger than the sum of its proper divisors (205727).

5121951313 is a wasteful number, since it uses less digits than its factorization.

5121951313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205726.

The product of its digits is 4050, while the sum is 31.

The square root of 5121951313 is about 71567.8091951961. The cubic root of 5121951313 is about 1723.7666813205.

The spelling of 5121951313 in words is "five billion, one hundred twenty-one million, nine hundred fifty-one thousand, three hundred thirteen".