55204551 has 16 divisors (see below), whose sum is σ = 81900000. Its totient is φ = 36751104.

The previous prime is 55204549. The next prime is 55204607. The reversal of 55204551 is 15540255.

It is not a de Polignac number, because 55204551 - 2¹ = 55204549 is a prime.

It is a super-2 number, since 2×55204551² = 6095084902223202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55204651) 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, 32905 + ... + 34541.

It is an arithmetic number, because the mean of its divisors is an integer number (5118750).

Almost surely, 2^55204551 is an apocalyptic number.

55204551 is a deficient number, since it is larger than the sum of its proper divisors (26695449).

55204551 is a wasteful number, since it uses less digits than its factorization.

55204551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895 (or 2889 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 55204551 is about 7429.9765140948. The cubic root of 55204551 is about 380.7661159878.

It can be divided in two parts, 55204 and 551, that added together give a palindrome (55755).

The spelling of 55204551 in words is "fifty-five million, two hundred four thousand, five hundred fifty-one".