51680207 has 4 divisors (see below), whose sum is σ = 51950976. Its totient is φ = 51409440.

The previous prime is 51680197. The next prime is 51680243. The reversal of 51680207 is 70208615.

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 51680207 - 2⁶ = 51680143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51680207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51640207) 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, 135098 + ... + 135479.

It is an arithmetic number, because the mean of its divisors is an integer number (12987744).

Almost surely, 2^51680207 is an apocalyptic number.

51680207 is a deficient number, since it is larger than the sum of its proper divisors (270769).

51680207 is a wasteful number, since it uses less digits than its factorization.

51680207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270768.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 51680207 is about 7188.8946994653. The cubic root of 51680207 is about 372.4843937428.

The spelling of 51680207 in words is "fifty-one million, six hundred eighty thousand, two hundred seven".