51438655 has 4 divisors (see below), whose sum is σ = 61726392. Its totient is φ = 41150920.

The previous prime is 51438613. The next prime is 51438661. The reversal of 51438655 is 55683415.

51438655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51438655 - 2¹¹ = 51436607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5143861 + ... + 5143870.

It is an arithmetic number, because the mean of its divisors is an integer number (15431598).

Almost surely, 2^51438655 is an apocalyptic number.

51438655 is a deficient number, since it is larger than the sum of its proper divisors (10287737).

51438655 is a wasteful number, since it uses less digits than its factorization.

51438655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10287736.

The product of its digits is 72000, while the sum is 37.

The square root of 51438655 is about 7172.0746649767. The cubic root of 51438655 is about 371.9031596500.

The spelling of 51438655 in words is "fifty-one million, four hundred thirty-eight thousand, six hundred fifty-five".