51864529 has 4 divisors (see below), whose sum is σ = 52575076. Its totient is φ = 51153984.

The previous prime is 51864521. The next prime is 51864551. The reversal of 51864529 is 92546815.

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 11833600 + 40030929 = 3440^2 + 6327^2 .

It is a cyclic number.

It is not a de Polignac number, because 51864529 - 2³ = 51864521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51864491 and 51864500.

It is not an unprimeable number, because it can be changed into a prime (51864521) 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, 355164 + ... + 355309.

It is an arithmetic number, because the mean of its divisors is an integer number (13143769).

Almost surely, 2^51864529 is an apocalyptic number.

It is an amenable number.

51864529 is a deficient number, since it is larger than the sum of its proper divisors (710547).

51864529 is an equidigital number, since it uses as much as digits as its factorization.

51864529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710546.

The product of its digits is 86400, while the sum is 40.

The square root of 51864529 is about 7201.7032013268. The cubic root of 51864529 is about 372.9267010911.

The spelling of 51864529 in words is "fifty-one million, eight hundred sixty-four thousand, five hundred twenty-nine".