51480637 has 4 divisors (see below), whose sum is σ = 55440700. Its totient is φ = 47520576.

The previous prime is 51480623. The next prime is 51480643. The reversal of 51480637 is 73608415.

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 28238596 + 23242041 = 5314^2 + 4821^2 .

It is a cyclic number.

It is not a de Polignac number, because 51480637 - 2¹⁹ = 50956349 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51480617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980012 + ... + 1980037.

It is an arithmetic number, because the mean of its divisors is an integer number (13860175).

Almost surely, 2^51480637 is an apocalyptic number.

It is an amenable number.

51480637 is a deficient number, since it is larger than the sum of its proper divisors (3960063).

51480637 is a wasteful number, since it uses less digits than its factorization.

51480637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960062.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 51480637 is about 7175.0008362369. Note that the first 3 decimals coincide. The cubic root of 51480637 is about 372.0043092151.

The spelling of 51480637 in words is "fifty-one million, four hundred eighty thousand, six hundred thirty-seven".