51643653 has 8 divisors (see below), whose sum is σ = 72482400. Its totient is φ = 32617008.

The previous prime is 51643651. The next prime is 51643681. The reversal of 51643653 is 35634615.

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

It is not a de Polignac number, because 51643653 - 2¹ = 51643651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643651) 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, 452958 + ... + 453071.

It is an arithmetic number, because the mean of its divisors is an integer number (9060300).

Almost surely, 2^51643653 is an apocalyptic number.

It is an amenable number.

51643653 is a deficient number, since it is larger than the sum of its proper divisors (20838747).

51643653 is a wasteful number, since it uses less digits than its factorization.

51643653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906051.

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

The square root of 51643653 is about 7186.3518561228. The cubic root of 51643653 is about 372.3965522087.

The spelling of 51643653 in words is "fifty-one million, six hundred forty-three thousand, six hundred fifty-three".