51643701 has 12 divisors (see below), whose sum is σ = 74706528. Its totient is φ = 34378344.

The previous prime is 51643699. The next prime is 51643721. The reversal of 51643701 is 10734615.

It is not a de Polignac number, because 51643701 - 2¹ = 51643699 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643721) 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, 2826 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (6225544).

Almost surely, 2^51643701 is an apocalyptic number.

It is an amenable number.

51643701 is a deficient number, since it is larger than the sum of its proper divisors (23062827).

51643701 is a wasteful number, since it uses less digits than its factorization.

51643701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472 (or 8469 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51643701 is about 7186.3551957860. The cubic root of 51643701 is about 372.3966675829.

The spelling of 51643701 in words is "fifty-one million, six hundred forty-three thousand, seven hundred one".