51018404 has 12 divisors (see below), whose sum is σ = 89457228. Its totient is φ = 25459200.

The previous prime is 51018371. The next prime is 51018419. The reversal of 51018404 is 40481015.

It can be written as a sum of positive squares in 2 ways, for example, as 5428900 + 45589504 = 2330^2 + 6752^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51018404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10157 + ... + 14324.

It is an arithmetic number, because the mean of its divisors is an integer number (7454769).

Almost surely, 2^51018404 is an apocalyptic number.

It is an amenable number.

51018404 is a deficient number, since it is larger than the sum of its proper divisors (38438824).

51018404 is a wasteful number, since it uses less digits than its factorization.

51018404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25006 (or 25004 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 51018404 is about 7142.7168500508. The cubic root of 51018404 is about 370.8875793668.

Adding to 51018404 its reverse (40481015), we get a palindrome (91499419).

The spelling of 51018404 in words is "fifty-one million, eighteen thousand, four hundred four".