801220989 has 4 divisors (see below), whose sum is σ = 1068294656. Its totient is φ = 534147324.

The previous prime is 801220969. The next prime is 801220991. The reversal of 801220989 is 989022108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 801220989 - 2⁵ = 801220957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801220969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133536829 + ... + 133536834.

It is an arithmetic number, because the mean of its divisors is an integer number (267073664).

Almost surely, 2^801220989 is an apocalyptic number.

It is an amenable number.

801220989 is a deficient number, since it is larger than the sum of its proper divisors (267073667).

801220989 is a wasteful number, since it uses less digits than its factorization.

801220989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267073666.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 801220989 is about 28305.8472581197. The cubic root of 801220989 is about 928.7898040661.

The spelling of 801220989 in words is "eight hundred one million, two hundred twenty thousand, nine hundred eighty-nine".