51399043 has 4 divisors (see below), whose sum is σ = 53633808. Its totient is φ = 49164280.

The previous prime is 51399037. The next prime is 51399053. The reversal of 51399043 is 34099315.

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 51399043 - 2⁵ = 51399011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51399053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117348 + ... + 1117393.

It is an arithmetic number, because the mean of its divisors is an integer number (13408452).

Almost surely, 2^51399043 is an apocalyptic number.

51399043 is a deficient number, since it is larger than the sum of its proper divisors (2234765).

51399043 is a wasteful number, since it uses less digits than its factorization.

51399043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234764.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 51399043 is about 7169.3125890841. The cubic root of 51399043 is about 371.8076697818.

The spelling of 51399043 in words is "fifty-one million, three hundred ninety-nine thousand, forty-three".