51322291 has 4 divisors (see below), whose sum is σ = 51389800. Its totient is φ = 51254784.

The previous prime is 51322259. The next prime is 51322309. The reversal of 51322291 is 19222315.

It is a happy number.

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 51322291 - 2⁵ = 51322259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51322231) 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, 32601 + ... + 34138.

It is an arithmetic number, because the mean of its divisors is an integer number (12847450).

Almost surely, 2^51322291 is an apocalyptic number.

51322291 is a deficient number, since it is larger than the sum of its proper divisors (67509).

51322291 is an equidigital number, since it uses as much as digits as its factorization.

51322291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67508.

The product of its digits is 1080, while the sum is 25.

The square root of 51322291 is about 7163.9577748616. The cubic root of 51322291 is about 371.6225094056.

The spelling of 51322291 in words is "fifty-one million, three hundred twenty-two thousand, two hundred ninety-one".