51891271 has 2 divisors, whose sum is σ = 51891272. Its totient is φ = 51891270.

The previous prime is 51891253. The next prime is 51891319. The reversal of 51891271 is 17219815.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51891271 - 2⁹ = 51890759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51891221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25945635 + 25945636.

It is an arithmetic number, because the mean of its divisors is an integer number (25945636).

Almost surely, 2^51891271 is an apocalyptic number.

51891271 is a deficient number, since it is larger than the sum of its proper divisors (1).

51891271 is an equidigital number, since it uses as much as digits as its factorization.

51891271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 51891271 is about 7203.5596061947. The cubic root of 51891271 is about 372.9907853023.

The spelling of 51891271 in words is "fifty-one million, eight hundred ninety-one thousand, two hundred seventy-one".