220649591 has 2 divisors, whose sum is σ = 220649592. Its totient is φ = 220649590.

The previous prime is 220649567. The next prime is 220649609. The reversal of 220649591 is 195946022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220649591 - 2²² = 216455287 is a 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 (220649521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110324795 + 110324796.

It is an arithmetic number, because the mean of its divisors is an integer number (110324796).

Almost surely, 2^220649591 is an apocalyptic number.

220649591 is a deficient number, since it is larger than the sum of its proper divisors (1).

220649591 is an equidigital number, since it uses as much as digits as its factorization.

220649591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 220649591 is about 14854.2785418882. The cubic root of 220649591 is about 604.2746501389.

The spelling of 220649591 in words is "two hundred twenty million, six hundred forty-nine thousand, five hundred ninety-one".