51985707 has 4 divisors (see below), whose sum is σ = 69314280. Its totient is φ = 34657136.

The previous prime is 51985693. The next prime is 51985721. The reversal of 51985707 is 70758915.

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 (51985693) and next prime (51985721).

It is a cyclic number.

It is not a de Polignac number, because 51985707 - 2⁷ = 51985579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51985757) 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, 8664282 + ... + 8664287.

It is an arithmetic number, because the mean of its divisors is an integer number (17328570).

Almost surely, 2^51985707 is an apocalyptic number.

51985707 is a deficient number, since it is larger than the sum of its proper divisors (17328573).

51985707 is a wasteful number, since it uses less digits than its factorization.

51985707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17328572.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 51985707 is about 7210.1114415798. Note that the first 3 decimals coincide. The cubic root of 51985707 is about 373.2169146108.

The spelling of 51985707 in words is "fifty-one million, nine hundred eighty-five thousand, seven hundred seven".