51343999 has 4 divisors (see below), whose sum is σ = 58678864. Its totient is φ = 44009136.

The previous prime is 51343997. The next prime is 51344003. The reversal of 51343999 is 99934315.

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 51343999 - 2¹ = 51343997 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 (51343991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667422 + ... + 3667435.

It is an arithmetic number, because the mean of its divisors is an integer number (14669716).

Almost surely, 2^51343999 is an apocalyptic number.

51343999 is a deficient number, since it is larger than the sum of its proper divisors (7334865).

51343999 is an equidigital number, since it uses as much as digits as its factorization.

51343999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334864.

The product of its digits is 131220, while the sum is 43.

The square root of 51343999 is about 7165.4726989920. The cubic root of 51343999 is about 371.6748975858.

The spelling of 51343999 in words is "fifty-one million, three hundred forty-three thousand, nine hundred ninety-nine".