25551207 has 48 divisors (see below), whose sum is σ = 42631680. Its totient is φ = 15289560.

The previous prime is 25551193. The next prime is 25551217. The reversal of 25551207 is 70215552.

It is a happy number.

It is not a de Polignac number, because 25551207 - 2⁴ = 25551191 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 (25551217) 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 47 ways as a sum of consecutive naturals, for example, 323394 + ... + 323472.

It is an arithmetic number, because the mean of its divisors is an integer number (888160).

Almost surely, 2^25551207 is an apocalyptic number.

25551207 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25551207 is a deficient number, since it is larger than the sum of its proper divisors (17080473).

25551207 is an frugal number, since it uses more digits than its factorization.

25551207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 93 counting only the distinct ones).

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

The square root of 25551207 is about 5054.8201748430. The cubic root of 25551207 is about 294.5351560653.

Adding to 25551207 its reverse (70215552), we get a palindrome (95766759).

The spelling of 25551207 in words is "twenty-five million, five hundred fifty-one thousand, two hundred seven".