51266643 has 4 divisors (see below), whose sum is σ = 68355528. Its totient is φ = 34177760.

The previous prime is 51266639. The next prime is 51266651. The reversal of 51266643 is 34666215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51266643 - 2² = 51266639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51266603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8544438 + ... + 8544443.

It is an arithmetic number, because the mean of its divisors is an integer number (17088882).

Almost surely, 2^51266643 is an apocalyptic number.

51266643 is a deficient number, since it is larger than the sum of its proper divisors (17088885).

51266643 is a wasteful number, since it uses less digits than its factorization.

51266643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17088884.

The product of its digits is 25920, while the sum is 33.

The square root of 51266643 is about 7160.0728348251. The cubic root of 51266643 is about 371.4881459035.

The spelling of 51266643 in words is "fifty-one million, two hundred sixty-six thousand, six hundred forty-three".