55200309 has 16 divisors (see below), whose sum is σ = 79833600. Its totient is φ = 33789440.

The previous prime is 55200307. The next prime is 55200319. The reversal of 55200309 is 90300255.

It is a cyclic number.

It is not a de Polignac number, because 55200309 - 2¹ = 55200307 is a prime.

It is a super-2 number, since 2×55200309² = 6094148227390962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55200307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11109 + ... + 15290.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^55200309 is an apocalyptic number.

It is an amenable number.

55200309 is a deficient number, since it is larger than the sum of its proper divisors (24633291).

55200309 is a wasteful number, since it uses less digits than its factorization.

55200309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26460.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 55200309 is about 7429.6910433745. The cubic root of 55200309 is about 380.7563628593.

The spelling of 55200309 in words is "fifty-five million, two hundred thousand, three hundred nine".