51680311 has 4 divisors (see below), whose sum is σ = 51723792. Its totient is φ = 51636832.

The previous prime is 51680309. The next prime is 51680327. The reversal of 51680311 is 11308615.

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 51680311 - 2¹ = 51680309 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 (51680351) 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, 19906 + ... + 22351.

It is an arithmetic number, because the mean of its divisors is an integer number (12930948).

Almost surely, 2^51680311 is an apocalyptic number.

51680311 is a deficient number, since it is larger than the sum of its proper divisors (43481).

51680311 is a wasteful number, since it uses less digits than its factorization.

51680311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43480.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 51680311 is about 7188.9019328406. The cubic root of 51680311 is about 372.4846436022.

Adding to 51680311 its reverse (11308615), we get a palindrome (62988926).

The spelling of 51680311 in words is "fifty-one million, six hundred eighty thousand, three hundred eleven".