1210220989 has 2 divisors, whose sum is σ = 1210220990. Its totient is φ = 1210220988.

The previous prime is 1210220983. The next prime is 1210221013. The reversal of 1210220989 is 9890220121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1023680025 + 186540964 = 31995^2 + 13658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210220989 - 2⁷ = 1210220861 is a prime.

It is a super-2 number, since 2×1210220989² = 2929269684432276242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210220983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110494 + 605110495.

It is an arithmetic number, because the mean of its divisors is an integer number (605110495).

Almost surely, 2^1210220989 is an apocalyptic number.

It is an amenable number.

1210220989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210220989 is an equidigital number, since it uses as much as digits as its factorization.

1210220989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1210220989 is about 34788.2306103659. The cubic root of 1210220989 is about 1065.6671050967.

The spelling of 1210220989 in words is "one billion, two hundred ten million, two hundred twenty thousand, nine hundred eighty-nine".