55220091 has 8 divisors (see below), whose sum is σ = 73679184. Its totient is φ = 36787200.

The previous prime is 55220069. The next prime is 55220101. The reversal of 55220091 is 19002255.

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

It is not a de Polignac number, because 55220091 - 2⁵ = 55220059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55220491) 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, 946 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (9209898).

Almost surely, 2^55220091 is an apocalyptic number.

55220091 is a deficient number, since it is larger than the sum of its proper divisors (18459093).

55220091 is a wasteful number, since it uses less digits than its factorization.

55220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13101.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 55220091 is about 7431.0222042462. The cubic root of 55220091 is about 380.8018410032.

The spelling of 55220091 in words is "fifty-five million, two hundred twenty thousand, ninety-one".