51671399 has 4 divisors (see below), whose sum is σ = 55646136. Its totient is φ = 47696664.

The previous prime is 51671339. The next prime is 51671413. The reversal of 51671399 is 99317615.

51671399 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 a de Polignac number, because none of the positive numbers 2^k-51671399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51671309) 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, 1987349 + ... + 1987374.

It is an arithmetic number, because the mean of its divisors is an integer number (13911534).

Almost surely, 2^51671399 is an apocalyptic number.

51671399 is a deficient number, since it is larger than the sum of its proper divisors (3974737).

51671399 is a wasteful number, since it uses less digits than its factorization.

51671399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974736.

The product of its digits is 51030, while the sum is 41.

The square root of 51671399 is about 7188.2820618003. The cubic root of 51671399 is about 372.4632313602.

The spelling of 51671399 in words is "fifty-one million, six hundred seventy-one thousand, three hundred ninety-nine".