1221550089 has 8 divisors (see below), whose sum is σ = 1630222560. Its totient is φ = 813622176.

The previous prime is 1221550073. The next prime is 1221550117. The reversal of 1221550089 is 9800551221.

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

It is not a de Polignac number, because 1221550089 - 2⁴ = 1221550073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221550019) 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, 182299 + ... + 188880.

It is an arithmetic number, because the mean of its divisors is an integer number (203777820).

Almost surely, 2^1221550089 is an apocalyptic number.

It is an amenable number.

1221550089 is a deficient number, since it is larger than the sum of its proper divisors (408672471).

1221550089 is a wasteful number, since it uses less digits than its factorization.

1221550089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372279.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 1221550089 is about 34950.6808088197. The cubic root of 1221550089 is about 1068.9820840259.

The spelling of 1221550089 in words is "one billion, two hundred twenty-one million, five hundred fifty thousand, eighty-nine".