55187247 has 4 divisors (see below), whose sum is σ = 73583000. Its totient is φ = 36791496.

The previous prime is 55187213. The next prime is 55187263. The reversal of 55187247 is 74278155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55187247 - 2⁶ = 55187183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55187207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9197872 + ... + 9197877.

It is an arithmetic number, because the mean of its divisors is an integer number (18395750).

Almost surely, 2^55187247 is an apocalyptic number.

55187247 is a deficient number, since it is larger than the sum of its proper divisors (18395753).

55187247 is a wasteful number, since it uses less digits than its factorization.

55187247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395752.

The product of its digits is 78400, while the sum is 39.

The square root of 55187247 is about 7428.8119507765. The cubic root of 55187247 is about 380.7263278104.

The spelling of 55187247 in words is "fifty-five million, one hundred eighty-seven thousand, two hundred forty-seven".