513981 has 24 divisors (see below), whose sum is σ = 838656. Its totient is φ = 300960.

The previous prime is 513977. The next prime is 513991. The reversal of 513981 is 189315.

It is not a de Polignac number, because 513981 - 2² = 513977 is a prime.

It is a super-2 number, since 2×513981² = 528352936722, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 513981.

It is not an unprimeable number, because it can be changed into a prime (513991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2596 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (34944).

2⁵¹³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

513981 is a deficient number, since it is larger than the sum of its proper divisors (324675).

513981 is a wasteful number, since it uses less digits than its factorization.

513981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 230 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 513981 is about 716.9246822366. The cubic root of 513981 is about 80.1030442998.

The spelling of 513981 in words is "five hundred thirteen thousand, nine hundred eighty-one".