55099215 has 24 divisors (see below), whose sum is σ = 97128720. Its totient is φ = 28886784.

The previous prime is 55099207. The next prime is 55099229. The reversal of 55099215 is 51299055.

55099215 is a `hidden beast` number, since 550 + 9 + 92 + 15 = 666.

It is not a de Polignac number, because 55099215 - 2³ = 55099207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55099215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7722 + ... + 13031.

It is an arithmetic number, because the mean of its divisors is an integer number (4047030).

Almost surely, 2^55099215 is an apocalyptic number.

55099215 is a deficient number, since it is larger than the sum of its proper divisors (42029505).

55099215 is a wasteful number, since it uses less digits than its factorization.

55099215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20823 (or 20820 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 55099215 is about 7422.8845471286. The cubic root of 55099215 is about 380.5237813961.

The spelling of 55099215 in words is "fifty-five million, ninety-nine thousand, two hundred fifteen".