220747987 has 2 divisors, whose sum is σ = 220747988. Its totient is φ = 220747986.

The previous prime is 220747973. The next prime is 220748027. The reversal of 220747987 is 789747022.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220747987 is a prime.

It is not a weakly prime, because it can be changed into another prime (220747927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110373993 + 110373994.

It is an arithmetic number, because the mean of its divisors is an integer number (110373994).

Almost surely, 2^220747987 is an apocalyptic number.

220747987 is a deficient number, since it is larger than the sum of its proper divisors (1).

220747987 is an equidigital number, since it uses as much as digits as its factorization.

220747987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 220747987 is about 14857.5902151055. The cubic root of 220747987 is about 604.3644597660.

The spelling of 220747987 in words is "two hundred twenty million, seven hundred forty-seven thousand, nine hundred eighty-seven".