51750861 has 8 divisors (see below), whose sum is σ = 69162240. Its totient is φ = 34420032.

The previous prime is 51750841. The next prime is 51750863. The reversal of 51750861 is 16805715.

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

It is not a de Polignac number, because 51750861 - 2¹¹ = 51748813 is a prime.

It is a super-2 number, since 2×51750861² = 5356303228482642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51750863) 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, 18621 + ... + 21218.

It is an arithmetic number, because the mean of its divisors is an integer number (8645280).

Almost surely, 2^51750861 is an apocalyptic number.

It is an amenable number.

51750861 is a deficient number, since it is larger than the sum of its proper divisors (17411379).

51750861 is a wasteful number, since it uses less digits than its factorization.

51750861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40275.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 51750861 is about 7193.8071283570. The cubic root of 51750861 is about 372.6540623629.

The spelling of 51750861 in words is "fifty-one million, seven hundred fifty thousand, eight hundred sixty-one".