51655279 has 4 divisors (see below), whose sum is σ = 55628776. Its totient is φ = 47681784.

The previous prime is 51655259. The next prime is 51655291. The reversal of 51655279 is 97255615.

51655279 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 a cyclic number.

It is not a de Polignac number, because 51655279 - 2¹³ = 51647087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51655229) by changing a digit.

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, 1986729 + ... + 1986754.

It is an arithmetic number, because the mean of its divisors is an integer number (13907194).

Almost surely, 2^51655279 is an apocalyptic number.

51655279 is a deficient number, since it is larger than the sum of its proper divisors (3973497).

51655279 is a wasteful number, since it uses less digits than its factorization.

51655279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973496.

The product of its digits is 94500, while the sum is 40.

The square root of 51655279 is about 7187.1607050351. The cubic root of 51655279 is about 372.4244947033.

The spelling of 51655279 in words is "fifty-one million, six hundred fifty-five thousand, two hundred seventy-nine".