513031387 has 4 divisors (see below), whose sum is σ = 559670616. Its totient is φ = 466392160.

The previous prime is 513031339. The next prime is 513031397. The reversal of 513031387 is 783130315.

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 513031387 - 2¹¹ = 513029339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513031397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23319598 + ... + 23319619.

It is an arithmetic number, because the mean of its divisors is an integer number (139917654).

Almost surely, 2^513031387 is an apocalyptic number.

513031387 is a deficient number, since it is larger than the sum of its proper divisors (46639229).

513031387 is a wasteful number, since it uses less digits than its factorization.

513031387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46639228.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 513031387 is about 22650.1961801659. The cubic root of 513031387 is about 800.5368204284.

The spelling of 513031387 in words is "five hundred thirteen million, thirty-one thousand, three hundred eighty-seven".