51655394 has 16 divisors (see below), whose sum is σ = 88649856. Its totient is φ = 22113600.

The previous prime is 51655391. The next prime is 51655399. The reversal of 51655394 is 49355615.

It is not an unprimeable number, because it can be changed into a prime (51655391) 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 7 ways as a sum of consecutive naturals, for example, 17699 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (5540616).

Almost surely, 2^51655394 is an apocalyptic number.

51655394 is a deficient number, since it is larger than the sum of its proper divisors (36994462).

51655394 is a wasteful number, since it uses less digits than its factorization.

51655394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081.

The product of its digits is 81000, while the sum is 38.

The square root of 51655394 is about 7187.1687054083. The cubic root of 51655394 is about 372.4247710789.

The spelling of 51655394 in words is "fifty-one million, six hundred fifty-five thousand, three hundred ninety-four".