51451636 has 12 divisors (see below), whose sum is σ = 90326628. Its totient is φ = 25644032.

The previous prime is 51451627. The next prime is 51451663. The reversal of 51451636 is 63615415.

It can be written as a sum of positive squares in 2 ways, for example, as 15523600 + 35928036 = 3940^2 + 5994^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51451598 and 51451607.

It is a congruent number.

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, 19021 + ... + 21556.

It is an arithmetic number, because the mean of its divisors is an integer number (7527219).

Almost surely, 2^51451636 is an apocalyptic number.

It is an amenable number.

51451636 is a deficient number, since it is larger than the sum of its proper divisors (38874992).

51451636 is a wasteful number, since it uses less digits than its factorization.

51451636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40898 (or 40896 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 51451636 is about 7172.9795761594. The cubic root of 51451636 is about 371.9344413704.

The spelling of 51451636 in words is "fifty-one million, four hundred fifty-one thousand, six hundred thirty-six".