503979991 has 2 divisors, whose sum is σ = 503979992. Its totient is φ = 503979990.

The previous prime is 503979953. The next prime is 503980007. The reversal of 503979991 is 199979305.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 503979991 - 2¹³ = 503971799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503979191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251989995 + 251989996.

It is an arithmetic number, because the mean of its divisors is an integer number (251989996).

Almost surely, 2^503979991 is an apocalyptic number.

503979991 is a deficient number, since it is larger than the sum of its proper divisors (1).

503979991 is an equidigital number, since it uses as much as digits as its factorization.

503979991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 688905, while the sum is 52.

The square root of 503979991 is about 22449.4986803715. The cubic root of 503979991 is about 795.8009100966.

The spelling of 503979991 in words is "five hundred three million, nine hundred seventy-nine thousand, nine hundred ninety-one".