521379503 has 2 divisors, whose sum is σ = 521379504. Its totient is φ = 521379502.

The previous prime is 521379377. The next prime is 521379541. The reversal of 521379503 is 305973125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521379503 is a prime.

It is a super-2 number, since 2×521379503² = 543673172297054018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521379563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260689751 + 260689752.

It is an arithmetic number, because the mean of its divisors is an integer number (260689752).

Almost surely, 2^521379503 is an apocalyptic number.

521379503 is a deficient number, since it is larger than the sum of its proper divisors (1).

521379503 is an equidigital number, since it uses as much as digits as its factorization.

521379503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 521379503 is about 22833.7360718740. The cubic root of 521379503 is about 804.8556267971.

The spelling of 521379503 in words is "five hundred twenty-one million, three hundred seventy-nine thousand, five hundred three".