220077989 has 2 divisors, whose sum is σ = 220077990. Its totient is φ = 220077988.

The previous prime is 220077983. The next prime is 220078087. The reversal of 220077989 is 989770022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210105025 + 9972964 = 14495^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 220077989 - 2⁴ = 220077973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220077983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110038994 + 110038995.

It is an arithmetic number, because the mean of its divisors is an integer number (110038995).

Almost surely, 2^220077989 is an apocalyptic number.

It is an amenable number.

220077989 is a deficient number, since it is larger than the sum of its proper divisors (1).

220077989 is an equidigital number, since it uses as much as digits as its factorization.

220077989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 220077989 is about 14835.0257498934. The cubic root of 220077989 is about 603.7523993178.

The spelling of 220077989 in words is "two hundred twenty million, seventy-seven thousand, nine hundred eighty-nine".