51700681 has 4 divisors (see below), whose sum is σ = 52355200. Its totient is φ = 51046164.

The previous prime is 51700679. The next prime is 51700703. The reversal of 51700681 is 18600715.

It is a happy number.

51700681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51700681 - 2¹ = 51700679 is a prime.

It is a super-2 number, since 2×51700681² = 5345920831727522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51700601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327141 + ... + 327298.

It is an arithmetic number, because the mean of its divisors is an integer number (13088800).

Almost surely, 2^51700681 is an apocalyptic number.

It is an amenable number.

51700681 is a deficient number, since it is larger than the sum of its proper divisors (654519).

51700681 is an equidigital number, since it uses as much as digits as its factorization.

51700681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654518.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 51700681 is about 7190.3185603977. The cubic root of 51700681 is about 372.5335759414.

The spelling of 51700681 in words is "fifty-one million, seven hundred thousand, six hundred eighty-one".