51320404 has 6 divisors (see below), whose sum is σ = 89810714. Its totient is φ = 25660200.

The previous prime is 51320393. The next prime is 51320411. The reversal of 51320404 is 40402315.

It can be written as a sum of positive squares in only one way, i.e., 46212804 + 5107600 = 6798^2 + 2260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6415047 + ... + 6415054.

Almost surely, 2^51320404 is an apocalyptic number.

It is an amenable number.

51320404 is a deficient number, since it is larger than the sum of its proper divisors (38490310).

51320404 is a wasteful number, since it uses less digits than its factorization.

51320404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830105 (or 12830103 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 51320404 is about 7163.8260727072. The cubic root of 51320404 is about 371.6179547877.

Adding to 51320404 its reverse (40402315), we get a palindrome (91722719).

The spelling of 51320404 in words is "fifty-one million, three hundred twenty thousand, four hundred four".