220649257 has 2 divisors, whose sum is σ = 220649258. Its totient is φ = 220649256.

The previous prime is 220649201. The next prime is 220649263. The reversal of 220649257 is 752946022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219158416 + 1490841 = 14804^2 + 1221^2 .

It is a cyclic number.

It is not a de Polignac number, because 220649257 - 2¹⁹ = 220124969 is a prime.

It is a super-2 number, since 2×220649257² = 97372189229304098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220649267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110324628 + 110324629.

It is an arithmetic number, because the mean of its divisors is an integer number (110324629).

Almost surely, 2^220649257 is an apocalyptic number.

It is an amenable number.

220649257 is a deficient number, since it is larger than the sum of its proper divisors (1).

220649257 is an equidigital number, since it uses as much as digits as its factorization.

220649257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 220649257 is about 14854.2672993319. The cubic root of 220649257 is about 604.2743452394.

The spelling of 220649257 in words is "two hundred twenty million, six hundred forty-nine thousand, two hundred fifty-seven".