521120251 has 2 divisors, whose sum is σ = 521120252. Its totient is φ = 521120250.

The previous prime is 521120213. The next prime is 521120279. The reversal of 521120251 is 152021125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521120251 - 2⁷ = 521120123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521120851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260560125 + 260560126.

It is an arithmetic number, because the mean of its divisors is an integer number (260560126).

Almost surely, 2^521120251 is an apocalyptic number.

521120251 is a deficient number, since it is larger than the sum of its proper divisors (1).

521120251 is an equidigital number, since it uses as much as digits as its factorization.

521120251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 521120251 is about 22828.0584150295. The cubic root of 521120251 is about 804.7222018963.

Adding to 521120251 its reverse (152021125), we get a palindrome (673141376).

The spelling of 521120251 in words is "five hundred twenty-one million, one hundred twenty thousand, two hundred fifty-one".