55512215 has 16 divisors (see below), whose sum is σ = 73906560. Its totient is φ = 39685920.

The previous prime is 55512187. The next prime is 55512221. The reversal of 55512215 is 51221555.

It is not a de Polignac number, because 55512215 - 2⁶ = 55512151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5309 + ... + 11798.

It is an arithmetic number, because the mean of its divisors is an integer number (4619160).

Almost surely, 2^55512215 is an apocalyptic number.

55512215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55512215 is a deficient number, since it is larger than the sum of its proper divisors (18394345).

55512215 is a wasteful number, since it uses less digits than its factorization.

55512215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17182.

The product of its digits is 2500, while the sum is 26.

The square root of 55512215 is about 7450.6519848937. The cubic root of 55512215 is about 381.4721632680.

The spelling of 55512215 in words is "fifty-five million, five hundred twelve thousand, two hundred fifteen".