55251207 has 64 divisors (see below), whose sum is σ = 97873920. Its totient is φ = 30412800.

The previous prime is 55251193. The next prime is 55251227. The reversal of 55251207 is 70215255.

It is a happy number.

It is not a de Polignac number, because 55251207 - 2¹⁰ = 55250183 is a prime.

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 (55251227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156343 + ... + 156695.

It is an arithmetic number, because the mean of its divisors is an integer number (1529280).

Almost surely, 2^55251207 is an apocalyptic number.

55251207 is a deficient number, since it is larger than the sum of its proper divisors (42622713).

55251207 is a wasteful number, since it uses less digits than its factorization.

55251207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 55251207 is about 7433.1155648221. The cubic root of 55251207 is about 380.8733536536.

The spelling of 55251207 in words is "fifty-five million, two hundred fifty-one thousand, two hundred seven".