513994493 has 2 divisors, whose sum is σ = 513994494. Its totient is φ = 513994492.

The previous prime is 513994483. The next prime is 513994531. The reversal of 513994493 is 394499315.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371024644 + 142969849 = 19262^2 + 11957^2 .

It is a cyclic number.

It is not a de Polignac number, because 513994493 - 2⁸ = 513994237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513994433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256997246 + 256997247.

It is an arithmetic number, because the mean of its divisors is an integer number (256997247).

Almost surely, 2^513994493 is an apocalyptic number.

It is an amenable number.

513994493 is a deficient number, since it is larger than the sum of its proper divisors (1).

513994493 is an equidigital number, since it uses as much as digits as its factorization.

513994493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 47.

The square root of 513994493 is about 22671.4466455054. The cubic root of 513994493 is about 801.0374524714.

The spelling of 513994493 in words is "five hundred thirteen million, nine hundred ninety-four thousand, four hundred ninety-three".