220997251 has 2 divisors, whose sum is σ = 220997252. Its totient is φ = 220997250.

The previous prime is 220997239. The next prime is 220997269. The reversal of 220997251 is 152799022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220997251 - 2²⁵ = 187442819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220997251.

It is not a weakly prime, because it can be changed into another prime (220997201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110498625 + 110498626.

It is an arithmetic number, because the mean of its divisors is an integer number (110498626).

Almost surely, 2^220997251 is an apocalyptic number.

220997251 is a deficient number, since it is larger than the sum of its proper divisors (1).

220997251 is an equidigital number, since it uses as much as digits as its factorization.

220997251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 220997251 is about 14865.9762881554. The cubic root of 220997251 is about 604.5918527584.

The spelling of 220997251 in words is "two hundred twenty million, nine hundred ninety-seven thousand, two hundred fifty-one".