51680257 has 4 divisors (see below), whose sum is σ = 51699760. Its totient is φ = 51660756.

The previous prime is 51680243. The next prime is 51680263. The reversal of 51680257 is 75208615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51680257 - 2⁷ = 51680129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51680557) 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, 5007 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (12924940).

Almost surely, 2^51680257 is an apocalyptic number.

It is an amenable number.

51680257 is a deficient number, since it is larger than the sum of its proper divisors (19503).

51680257 is a wasteful number, since it uses less digits than its factorization.

51680257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19502.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 51680257 is about 7188.8981770505. The cubic root of 51680257 is about 372.4845138676.

The spelling of 51680257 in words is "fifty-one million, six hundred eighty thousand, two hundred fifty-seven".