1220523257 has 2 divisors, whose sum is σ = 1220523258. Its totient is φ = 1220523256.

The previous prime is 1220523251. The next prime is 1220523259. The reversal of 1220523257 is 7523250221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204714681 + 15808576 = 34709^2 + 3976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220523257 - 2⁶ = 1220523193 is a prime.

Together with 1220523259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1220523251) 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, 610261628 + 610261629.

It is an arithmetic number, because the mean of its divisors is an integer number (610261629).

Almost surely, 2^1220523257 is an apocalyptic number.

It is an amenable number.

1220523257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220523257 is an equidigital number, since it uses as much as digits as its factorization.

1220523257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 1220523257 is about 34935.9879923268. The cubic root of 1220523257 is about 1068.6824721558.

Adding to 1220523257 its reverse (7523250221), we get a palindrome (8743773478).

The spelling of 1220523257 in words is "one billion, two hundred twenty million, five hundred twenty-three thousand, two hundred fifty-seven".