51003399 has 4 divisors (see below), whose sum is σ = 68004536. Its totient is φ = 34002264.

The previous prime is 51003377. The next prime is 51003419. The reversal of 51003399 is 99330015.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-51003399 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 (51003299) 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, 8500564 + ... + 8500569.

It is an arithmetic number, because the mean of its divisors is an integer number (17001134).

Almost surely, 2^51003399 is an apocalyptic number.

51003399 is a deficient number, since it is larger than the sum of its proper divisors (17001137).

51003399 is a wasteful number, since it uses less digits than its factorization.

51003399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001136.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 51003399 is about 7141.6664021781. Note that the first 3 decimals coincide. The cubic root of 51003399 is about 370.8512152748.

The spelling of 51003399 in words is "fifty-one million, three thousand, three hundred ninety-nine".