51271591 has 12 divisors (see below), whose sum is σ = 59850912. Its totient is φ = 43793568.

The previous prime is 51271589. The next prime is 51271621. The reversal of 51271591 is 19517215.

It is not a de Polignac number, because 51271591 - 2¹ = 51271589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51271691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13666 + ... + 17008.

It is an arithmetic number, because the mean of its divisors is an integer number (4987576).

Almost surely, 2^51271591 is an apocalyptic number.

51271591 is a deficient number, since it is larger than the sum of its proper divisors (8579321).

51271591 is a wasteful number, since it uses less digits than its factorization.

51271591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670 (or 3663 counting only the distinct ones).

The product of its digits is 3150, while the sum is 31.

The square root of 51271591 is about 7160.4183536997. The cubic root of 51271591 is about 371.5000969117.

The spelling of 51271591 in words is "fifty-one million, two hundred seventy-one thousand, five hundred ninety-one".