513042921 has 12 divisors (see below), whose sum is σ = 780065520. Its totient is φ = 324027000.

The previous prime is 513042917. The next prime is 513042941. The reversal of 513042921 is 129240315.

It is not a de Polignac number, because 513042921 - 2² = 513042917 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (513042911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1499955 + ... + 1500296.

It is an arithmetic number, because the mean of its divisors is an integer number (65005460).

Almost surely, 2^513042921 is an apocalyptic number.

It is an amenable number.

513042921 is a deficient number, since it is larger than the sum of its proper divisors (267022599).

513042921 is a wasteful number, since it uses less digits than its factorization.

513042921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000276 (or 3000273 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 513042921 is about 22650.4507902161. The cubic root of 513042921 is about 800.5428196211.

The spelling of 513042921 in words is "five hundred thirteen million, forty-two thousand, nine hundred twenty-one".