51512271 has 4 divisors (see below), whose sum is σ = 68683032. Its totient is φ = 34341512.

The previous prime is 51512267. The next prime is 51512281. The reversal of 51512271 is 17221515.

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 51512271 - 2² = 51512267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51512281) 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, 8585376 + ... + 8585381.

It is an arithmetic number, because the mean of its divisors is an integer number (17170758).

Almost surely, 2^51512271 is an apocalyptic number.

51512271 is a deficient number, since it is larger than the sum of its proper divisors (17170761).

51512271 is a wasteful number, since it uses less digits than its factorization.

51512271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17170760.

The product of its digits is 700, while the sum is 24.

The square root of 51512271 is about 7177.2049573633. The cubic root of 51512271 is about 372.0804904450.

Adding to 51512271 its reverse (17221515), we get a palindrome (68733786).

The spelling of 51512271 in words is "fifty-one million, five hundred twelve thousand, two hundred seventy-one".