51457685 has 4 divisors (see below), whose sum is σ = 61749228. Its totient is φ = 41166144.

The previous prime is 51457673. The next prime is 51457697. The reversal of 51457685 is 58675415.

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

It is an interprime number because it is at equal distance from previous prime (51457673) and next prime (51457697).

It can be written as a sum of positive squares in 2 ways, for example, as 39025009 + 12432676 = 6247^2 + 3526^2 .

It is a cyclic number.

It is not a de Polignac number, because 51457685 - 2²⁴ = 34680469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5145764 + ... + 5145773.

It is an arithmetic number, because the mean of its divisors is an integer number (15437307).

Almost surely, 2^51457685 is an apocalyptic number.

It is an amenable number.

51457685 is a deficient number, since it is larger than the sum of its proper divisors (10291543).

51457685 is a wasteful number, since it uses less digits than its factorization.

51457685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291542.

The product of its digits is 168000, while the sum is 41.

The square root of 51457685 is about 7173.4012156020. The cubic root of 51457685 is about 371.9490165031.

The spelling of 51457685 in words is "fifty-one million, four hundred fifty-seven thousand, six hundred eighty-five".