51138452 has 6 divisors (see below), whose sum is σ = 89492298. Its totient is φ = 25569224.

The previous prime is 51138413. The next prime is 51138457. The reversal of 51138452 is 25483115.

It can be written as a sum of positive squares in only one way, i.e., 42588676 + 8549776 = 6526^2 + 2924^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392303 + ... + 6392310.

It is an arithmetic number, because the mean of its divisors is an integer number (14915383).

Almost surely, 2^51138452 is an apocalyptic number.

It is an amenable number.

51138452 is a deficient number, since it is larger than the sum of its proper divisors (38353846).

51138452 is a wasteful number, since it uses less digits than its factorization.

51138452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784617 (or 12784615 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 51138452 is about 7151.1154374685. The cubic root of 51138452 is about 371.1782550957.

The spelling of 51138452 in words is "fifty-one million, one hundred thirty-eight thousand, four hundred fifty-two".