1220522791 has 2 divisors, whose sum is σ = 1220522792. Its totient is φ = 1220522790.

The previous prime is 1220522789. The next prime is 1220522819. The reversal of 1220522791 is 1972250221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220522791 - 2¹ = 1220522789 is a prime.

Together with 1220522789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220522711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610261395 + 610261396.

It is an arithmetic number, because the mean of its divisors is an integer number (610261396).

Almost surely, 2^1220522791 is an apocalyptic number.

1220522791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220522791 is an equidigital number, since it uses as much as digits as its factorization.

1220522791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1220522791 is about 34935.9813229856. The cubic root of 1220522791 is about 1068.6823361469.

The spelling of 1220522791 in words is "one billion, two hundred twenty million, five hundred twenty-two thousand, seven hundred ninety-one".