51503399 has 8 divisors (see below), whose sum is σ = 53114880. Its totient is φ = 49913496.

The previous prime is 51503393. The next prime is 51503407. The reversal of 51503399 is 99330515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51503399 - 2⁴ = 51503383 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 (51503393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479 + ... + 10160.

It is an arithmetic number, because the mean of its divisors is an integer number (6639360).

Almost surely, 2^51503399 is an apocalyptic number.

51503399 is a deficient number, since it is larger than the sum of its proper divisors (1611481).

51503399 is a wasteful number, since it uses less digits than its factorization.

51503399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10789.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 51503399 is about 7176.5868628478. The cubic root of 51503399 is about 372.0591279775.

The spelling of 51503399 in words is "fifty-one million, five hundred three thousand, three hundred ninety-nine".