220553731 has 2 divisors, whose sum is σ = 220553732. Its totient is φ = 220553730.

The previous prime is 220553713. The next prime is 220553783. The reversal of 220553731 is 137355022.

Together with previous prime (220553713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220553731 is a prime.

It is a super-2 number, since 2×220553731² = 97287896516040722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220553731.

It is not a weakly prime, because it can be changed into another prime (220523731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110276865 + 110276866.

It is an arithmetic number, because the mean of its divisors is an integer number (110276866).

Almost surely, 2^220553731 is an apocalyptic number.

220553731 is a deficient number, since it is larger than the sum of its proper divisors (1).

220553731 is an equidigital number, since it uses as much as digits as its factorization.

220553731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 220553731 is about 14851.0515115934. The cubic root of 220553731 is about 604.1871295318.

The spelling of 220553731 in words is "two hundred twenty million, five hundred fifty-three thousand, seven hundred thirty-one".