520222991 has 2 divisors, whose sum is σ = 520222992. Its totient is φ = 520222990.

The previous prime is 520222891. The next prime is 520223107. The reversal of 520222991 is 199222025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520222991 - 2¹⁰ = 520221967 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520222891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260111495 + 260111496.

It is an arithmetic number, because the mean of its divisors is an integer number (260111496).

Almost surely, 2^520222991 is an apocalyptic number.

520222991 is a deficient number, since it is larger than the sum of its proper divisors (1).

520222991 is an equidigital number, since it uses as much as digits as its factorization.

520222991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 520222991 is about 22808.3973790356. The cubic root of 520222991 is about 804.2600821701.

The spelling of 520222991 in words is "five hundred twenty million, two hundred twenty-two thousand, nine hundred ninety-one".