51645803 has 4 divisors (see below), whose sum is σ = 56340888. Its totient is φ = 46950720.

The previous prime is 51645793. The next prime is 51645817. The reversal of 51645803 is 30854615.

It is a happy number.

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 51645803 - 2⁸ = 51645547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51645803.

It is not an unprimeable number, because it can be changed into a prime (51645823) 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, 2347526 + ... + 2347547.

It is an arithmetic number, because the mean of its divisors is an integer number (14085222).

Almost surely, 2^51645803 is an apocalyptic number.

51645803 is a deficient number, since it is larger than the sum of its proper divisors (4695085).

51645803 is a wasteful number, since it uses less digits than its factorization.

51645803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695084.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 51645803 is about 7186.5014436790. The cubic root of 51645803 is about 372.4017199395.

The spelling of 51645803 in words is "fifty-one million, six hundred forty-five thousand, eight hundred three".