51988861 has 8 divisors (see below), whose sum is σ = 53364024. Its totient is φ = 50618880.

The previous prime is 51988837. The next prime is 51988879. The reversal of 51988861 is 16888915.

It can be written as a sum of positive squares in 4 ways, for example, as 1223236 + 50765625 = 1106^2 + 7125^2 .

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 51988861 - 2¹⁷ = 51857789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51988831) 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, 26821 + ... + 28693.

It is an arithmetic number, because the mean of its divisors is an integer number (6670503).

Almost surely, 2^51988861 is an apocalyptic number.

It is an amenable number.

51988861 is a deficient number, since it is larger than the sum of its proper divisors (1375163).

51988861 is a wasteful number, since it uses less digits than its factorization.

51988861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591.

The product of its digits is 138240, while the sum is 46.

The square root of 51988861 is about 7210.3301588762. The cubic root of 51988861 is about 373.2244622132.

The spelling of 51988861 in words is "fifty-one million, nine hundred eighty-eight thousand, eight hundred sixty-one".