51943291 has 4 divisors (see below), whose sum is σ = 52718632. Its totient is φ = 51167952.

The previous prime is 51943267. The next prime is 51943349. The reversal of 51943291 is 19234915.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51943291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51943201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387570 + ... + 387703.

It is an arithmetic number, because the mean of its divisors is an integer number (13179658).

Almost surely, 2^51943291 is an apocalyptic number.

51943291 is a deficient number, since it is larger than the sum of its proper divisors (775341).

51943291 is an equidigital number, since it uses as much as digits as its factorization.

51943291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775340.

The product of its digits is 9720, while the sum is 34.

The square root of 51943291 is about 7207.1694166295. The cubic root of 51943291 is about 373.1153823696.

The spelling of 51943291 in words is "fifty-one million, nine hundred forty-three thousand, two hundred ninety-one".