51271749 has 6 divisors (see below), whose sum is σ = 74059206. Its totient is φ = 34181160.

The previous prime is 51271733. The next prime is 51271789. The reversal of 51271749 is 94717215.

It is a happy number.

51271749 is a `hidden beast` number, since 512 + 71 + 74 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38526849 + 12744900 = 6207^2 + 3570^2 .

It is not a de Polignac number, because 51271749 - 2⁴ = 51271733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51271729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2848422 + ... + 2848439.

It is an arithmetic number, because the mean of its divisors is an integer number (12343201).

Almost surely, 2^51271749 is an apocalyptic number.

It is an amenable number.

51271749 is a deficient number, since it is larger than the sum of its proper divisors (22787457).

51271749 is a wasteful number, since it uses less digits than its factorization.

51271749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696867 (or 5696864 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 51271749 is about 7160.4293865661. The cubic root of 51271749 is about 371.5004785197.

The spelling of 51271749 in words is "fifty-one million, two hundred seventy-one thousand, seven hundred forty-nine".