51986257 has 8 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 50995920.

The previous prime is 51986243. The next prime is 51986267. The reversal of 51986257 is 75268915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51986257 - 2²³ = 43597649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51986227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50407 + ... + 51427.

It is an arithmetic number, because the mean of its divisors is an integer number (6622560).

Almost surely, 2^51986257 is an apocalyptic number.

It is an amenable number.

51986257 is a deficient number, since it is larger than the sum of its proper divisors (994223).

51986257 is a wasteful number, since it uses less digits than its factorization.

51986257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943.

The product of its digits is 151200, while the sum is 43.

The square root of 51986257 is about 7210.1495823596. The cubic root of 51986257 is about 373.2182307968.

The spelling of 51986257 in words is "fifty-one million, nine hundred eighty-six thousand, two hundred fifty-seven".