51081207 has 4 divisors (see below), whose sum is σ = 68108280. Its totient is φ = 34054136.

The previous prime is 51081187. The next prime is 51081221. The reversal of 51081207 is 70218015.

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

It is a cyclic number.

It is not a de Polignac number, because 51081207 - 2⁶ = 51081143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51081007) 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, 8513532 + ... + 8513537.

It is an arithmetic number, because the mean of its divisors is an integer number (17027070).

Almost surely, 2^51081207 is an apocalyptic number.

51081207 is a deficient number, since it is larger than the sum of its proper divisors (17027073).

51081207 is a wasteful number, since it uses less digits than its factorization.

51081207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17027072.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 51081207 is about 7147.1117942845. Note that the first 3 decimals coincide. The cubic root of 51081207 is about 371.0397029119.

The spelling of 51081207 in words is "fifty-one million, eighty-one thousand, two hundred seven".