51643485 has 48 divisors (see below), whose sum is σ = 92352000. Its totient is φ = 26687232.

The previous prime is 51643481. The next prime is 51643499. The reversal of 51643485 is 58434615.

It is a happy number.

51643485 is a `hidden beast` number, since 5 + 1 + 643 + 4 + 8 + 5 = 666.

It is not a de Polignac number, because 51643485 - 2² = 51643481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 259416 + ... + 259614.

It is an arithmetic number, because the mean of its divisors is an integer number (1924000).

Almost surely, 2^51643485 is an apocalyptic number.

It is an amenable number.

51643485 is a deficient number, since it is larger than the sum of its proper divisors (40708515).

51643485 is a wasteful number, since it uses less digits than its factorization.

51643485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 359 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 51643485 is about 7186.3401672896. The cubic root of 51643485 is about 372.3961483986.

It can be divided in two parts, 5164 and 3485, that added together give a square (8649 = 93²).

The spelling of 51643485 in words is "fifty-one million, six hundred forty-three thousand, four hundred eighty-five".