513997903 has 2 divisors, whose sum is σ = 513997904. Its totient is φ = 513997902.

The previous prime is 513997837. The next prime is 513997919. The reversal of 513997903 is 309799315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 513997903 - 2²¹ = 511900751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513997973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256998951 + 256998952.

It is an arithmetic number, because the mean of its divisors is an integer number (256998952).

Almost surely, 2^513997903 is an apocalyptic number.

513997903 is a deficient number, since it is larger than the sum of its proper divisors (1).

513997903 is an equidigital number, since it uses as much as digits as its factorization.

513997903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 46.

The square root of 513997903 is about 22671.5218501097. The cubic root of 513997903 is about 801.0392239117.

The spelling of 513997903 in words is "five hundred thirteen million, nine hundred ninety-seven thousand, nine hundred three".