201220989 has 8 divisors (see below), whose sum is σ = 274838592. Its totient is φ = 130875360.

The previous prime is 201220949. The next prime is 201220991. The reversal of 201220989 is 989022102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201220989 - 2¹² = 201216893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817849 + ... + 818094.

It is an arithmetic number, because the mean of its divisors is an integer number (34354824).

Almost surely, 2^201220989 is an apocalyptic number.

It is an amenable number.

201220989 is a deficient number, since it is larger than the sum of its proper divisors (73617603).

201220989 is a wasteful number, since it uses less digits than its factorization.

201220989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635987.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 201220989 is about 14185.2384188635. The cubic root of 201220989 is about 585.9911985616.

The spelling of 201220989 in words is "two hundred one million, two hundred twenty thousand, nine hundred eighty-nine".