55215325 has 18 divisors (see below), whose sum is σ = 75261242. Its totient is φ = 40154400.

The previous prime is 55215323. The next prime is 55215331. The reversal of 55215325 is 52351255.

55215325 = 304² + 305² + ... + 578².

55215325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 736164 + 54479161 = 858^2 + 7381^2 .

It is not a de Polignac number, because 55215325 - 2¹ = 55215323 is a prime.

It is a super-2 number, since 2×55215325² = 6097464229711250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55215293 and 55215302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55215323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6102 + ... + 12151.

Almost surely, 2^55215325 is an apocalyptic number.

55215325 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55215325 is a deficient number, since it is larger than the sum of its proper divisors (20045917).

55215325 is a wasteful number, since it uses less digits than its factorization.

55215325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18285 (or 18269 counting only the distinct ones).

The product of its digits is 7500, while the sum is 28.

The square root of 55215325 is about 7430.7015146620. The cubic root of 55215325 is about 380.7908851249.

The spelling of 55215325 in words is "fifty-five million, two hundred fifteen thousand, three hundred twenty-five".