51399135 has 48 divisors (see below), whose sum is σ = 94820544. Its totient is φ = 25698816.

The previous prime is 51399097. The next prime is 51399137. The reversal of 51399135 is 53199315.

51399135 is a `hidden beast` number, since 513 + 9 + 9 + 135 = 666.

51399135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51399135 - 2⁶ = 51399071 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 51399135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399137) 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 47 ways as a sum of consecutive naturals, for example, 54387 + ... + 55323.

It is an arithmetic number, because the mean of its divisors is an integer number (1975428).

Almost surely, 2^51399135 is an apocalyptic number.

51399135 is a deficient number, since it is larger than the sum of its proper divisors (43421409).

51399135 is a wasteful number, since it uses less digits than its factorization.

51399135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1021 counting only the distinct ones).

The product of its digits is 18225, while the sum is 36.

The square root of 51399135 is about 7169.3190053170. The cubic root of 51399135 is about 371.8078916166.

The spelling of 51399135 in words is "fifty-one million, three hundred ninety-nine thousand, one hundred thirty-five".