7513813257 has 4 divisors (see below), whose sum is σ = 10018417680. Its totient is φ = 5009208836.

The previous prime is 7513813247. The next prime is 7513813271. The reversal of 7513813257 is 7523183157.

It is a happy number.

7513813257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 7513813257 - 2⁶ = 7513813193 is a prime.

It is a super-2 number, since 2×7513813257² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7513813247) 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, 1252302207 + ... + 1252302212.

It is an arithmetic number, because the mean of its divisors is an integer number (2504604420).

Almost surely, 2^7513813257 is an apocalyptic number.

It is an amenable number.

7513813257 is a deficient number, since it is larger than the sum of its proper divisors (2504604423).

7513813257 is a wasteful number, since it uses less digits than its factorization.

7513813257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504604422.

The product of its digits is 176400, while the sum is 42.

The square root of 7513813257 is about 86682.2545680487. The cubic root of 7513813257 is about 1958.6347963098.

The spelling of 7513813257 in words is "seven billion, five hundred thirteen million, eight hundred thirteen thousand, two hundred fifty-seven".