513231125251 has 4 divisors (see below), whose sum is σ = 552710442592. Its totient is φ = 473751807912.

The previous prime is 513231125081. The next prime is 513231125293. The reversal of 513231125251 is 152521132315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 513231125251 - 2¹⁹ = 513230600963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513231125051) 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, 19739658651 + ... + 19739658676.

It is an arithmetic number, because the mean of its divisors is an integer number (138177610648).

Almost surely, 2^513231125251 is an apocalyptic number.

513231125251 is a deficient number, since it is larger than the sum of its proper divisors (39479317341).

513231125251 is a wasteful number, since it uses less digits than its factorization.

513231125251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39479317340.

The product of its digits is 9000, while the sum is 31.

Adding to 513231125251 its reverse (152521132315), we get a palindrome (665752257566).

The spelling of 513231125251 in words is "five hundred thirteen billion, two hundred thirty-one million, one hundred twenty-five thousand, two hundred fifty-one".