521223331 has 2 divisors, whose sum is σ = 521223332. Its totient is φ = 521223330.

The previous prime is 521223323. The next prime is 521223341. The reversal of 521223331 is 133322125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521223331 - 2³ = 521223323 is a prime.

It is a super-2 number, since 2×521223331² = 543347521557471122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521223341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260611665 + 260611666.

It is an arithmetic number, because the mean of its divisors is an integer number (260611666).

Almost surely, 2^521223331 is an apocalyptic number.

521223331 is a deficient number, since it is larger than the sum of its proper divisors (1).

521223331 is an equidigital number, since it uses as much as digits as its factorization.

521223331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 22.

The square root of 521223331 is about 22830.3160512508. The cubic root of 521223331 is about 804.7752576582.

Adding to 521223331 its reverse (133322125), we get a palindrome (654545456).

The spelling of 521223331 in words is "five hundred twenty-one million, two hundred twenty-three thousand, three hundred thirty-one".