513625981 has 8 divisors (see below), whose sum is σ = 593279424. Its totient is φ = 439465920.

The previous prime is 513625921. The next prime is 513625991. The reversal of 513625981 is 189526315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 513625981 - 2²³ = 505237373 is a prime.

It is a super-2 number, since 2×513625981² = 527623296716424722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513625921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373145 + ... + 1373518.

It is an arithmetic number, because the mean of its divisors is an integer number (74159928).

Almost surely, 2^513625981 is an apocalyptic number.

It is an amenable number.

513625981 is a deficient number, since it is larger than the sum of its proper divisors (79653443).

513625981 is a wasteful number, since it uses less digits than its factorization.

513625981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746691.

The product of its digits is 64800, while the sum is 40.

The square root of 513625981 is about 22663.3179609694. The cubic root of 513625981 is about 800.8459702068.

The spelling of 513625981 in words is "five hundred thirteen million, six hundred twenty-five thousand, nine hundred eighty-one".