51636543 has 12 divisors (see below), whose sum is σ = 80089560. Its totient is φ = 29506512.

The previous prime is 51636539. The next prime is 51636551. The reversal of 51636543 is 34563615.

It is not a de Polignac number, because 51636543 - 2² = 51636539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51636583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175488 + ... + 175781.

It is an arithmetic number, because the mean of its divisors is an integer number (6674130).

Almost surely, 2^51636543 is an apocalyptic number.

51636543 is a deficient number, since it is larger than the sum of its proper divisors (28453017).

51636543 is a wasteful number, since it uses less digits than its factorization.

51636543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351286 (or 351279 counting only the distinct ones).

The product of its digits is 32400, while the sum is 33.

The square root of 51636543 is about 7185.8571513773. The cubic root of 51636543 is about 372.3794616219.

The spelling of 51636543 in words is "fifty-one million, six hundred thirty-six thousand, five hundred forty-three".