521120491 has 2 divisors, whose sum is σ = 521120492. Its totient is φ = 521120490.

The previous prime is 521120471. The next prime is 521120513. The reversal of 521120491 is 194021125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521120491 - 2⁹ = 521119979 is a prime.

It is a super-2 number, since 2×521120491² = 543133132280162162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521120471) 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, 260560245 + 260560246.

It is an arithmetic number, because the mean of its divisors is an integer number (260560246).

Almost surely, 2^521120491 is an apocalyptic number.

521120491 is a deficient number, since it is larger than the sum of its proper divisors (1).

521120491 is an equidigital number, since it uses as much as digits as its factorization.

521120491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 521120491 is about 22828.0636717178. The cubic root of 521120491 is about 804.7223254336.

The spelling of 521120491 in words is "five hundred twenty-one million, one hundred twenty thousand, four hundred ninety-one".