51788861 has 4 divisors (see below), whose sum is σ = 52301724. Its totient is φ = 51276000.

The previous prime is 51788857. The next prime is 51788873. The reversal of 51788861 is 16888715.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33988900 + 17799961 = 5830^2 + 4219^2 .

It is a cyclic number.

It is not a de Polignac number, because 51788861 - 2² = 51788857 is a prime.

It is a super-2 number, since 2×51788861² = 5364172247354642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51787861) 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, 256280 + ... + 256481.

It is an arithmetic number, because the mean of its divisors is an integer number (13075431).

Almost surely, 2^51788861 is an apocalyptic number.

It is an amenable number.

51788861 is a deficient number, since it is larger than the sum of its proper divisors (512863).

51788861 is a wasteful number, since it uses less digits than its factorization.

51788861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512862.

The product of its digits is 107520, while the sum is 44.

The square root of 51788861 is about 7196.4478042990. The cubic root of 51788861 is about 372.7452517619.

The spelling of 51788861 in words is "fifty-one million, seven hundred eighty-eight thousand, eight hundred sixty-one".