51536643 has 8 divisors (see below), whose sum is σ = 69842256. Its totient is φ = 33794400.

The previous prime is 51536623. The next prime is 51536659. The reversal of 51536643 is 34663515.

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

It is not a de Polignac number, because 51536643 - 2²¹ = 49439491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51536623) 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, 140628 + ... + 140993.

It is an arithmetic number, because the mean of its divisors is an integer number (8730282).

Almost surely, 2^51536643 is an apocalyptic number.

51536643 is a deficient number, since it is larger than the sum of its proper divisors (18305613).

51536643 is a wasteful number, since it uses less digits than its factorization.

51536643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281685.

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

The square root of 51536643 is about 7178.9026320184. The cubic root of 51536643 is about 372.1391620052.

The spelling of 51536643 in words is "fifty-one million, five hundred thirty-six thousand, six hundred forty-three".