51087207 has 4 divisors (see below), whose sum is σ = 68116280. Its totient is φ = 34058136.

The previous prime is 51087191. The next prime is 51087233. The reversal of 51087207 is 70278015.

It is a happy number.

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

It is not a de Polignac number, because 51087207 - 2⁴ = 51087191 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 (51087007) 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, 8514532 + ... + 8514537.

It is an arithmetic number, because the mean of its divisors is an integer number (17029070).

Almost surely, 2^51087207 is an apocalyptic number.

51087207 is a deficient number, since it is larger than the sum of its proper divisors (17029073).

51087207 is a wasteful number, since it uses less digits than its factorization.

51087207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17029072.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 51087207 is about 7147.5315319346. The cubic root of 51087207 is about 371.0542297878.

The spelling of 51087207 in words is "fifty-one million, eighty-seven thousand, two hundred seven".