51271217 has 4 divisors (see below), whose sum is σ = 53039220. Its totient is φ = 49503216.

The previous prime is 51271211. The next prime is 51271223. The reversal of 51271217 is 71217215.

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

It is an interprime number because it is at equal distance from previous prime (51271211) and next prime (51271223).

It can be written as a sum of positive squares in 2 ways, for example, as 31990336 + 19280881 = 5656^2 + 4391^2 .

It is a cyclic number.

It is not a de Polignac number, because 51271217 - 2⁶ = 51271153 is a prime.

It is a super-2 number, since 2×51271217² = 5257475385322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51271211) 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, 883958 + ... + 884015.

It is an arithmetic number, because the mean of its divisors is an integer number (13259805).

Almost surely, 2^51271217 is an apocalyptic number.

It is an amenable number.

51271217 is a deficient number, since it is larger than the sum of its proper divisors (1768003).

51271217 is a wasteful number, since it uses less digits than its factorization.

51271217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768002.

The product of its digits is 980, while the sum is 26.

The square root of 51271217 is about 7160.3922378596. The cubic root of 51271217 is about 371.4991936085.

The spelling of 51271217 in words is "fifty-one million, two hundred seventy-one thousand, two hundred seventeen".