513949691 has 2 divisors, whose sum is σ = 513949692. Its totient is φ = 513949690.

The previous prime is 513949673. The next prime is 513949693. The reversal of 513949691 is 196949315.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513949691 - 2¹⁰ = 513948667 is a prime.

Together with 513949693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (513949693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256974845 + 256974846.

It is an arithmetic number, because the mean of its divisors is an integer number (256974846).

Almost surely, 2^513949691 is an apocalyptic number.

513949691 is a deficient number, since it is larger than the sum of its proper divisors (1).

513949691 is an equidigital number, since it uses as much as digits as its factorization.

513949691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 47.

The square root of 513949691 is about 22670.4585529274. The cubic root of 513949691 is about 801.0141778234.

The spelling of 513949691 in words is "five hundred thirteen million, nine hundred forty-nine thousand, six hundred ninety-one".