51321447 has 12 divisors (see below), whose sum is σ = 74219184. Its totient is φ = 34173600.

The previous prime is 51321421. The next prime is 51321449. The reversal of 51321447 is 74412315.

51321447 is a `hidden beast` number, since 513 + 2 + 144 + 7 = 666.

It is not a de Polignac number, because 51321447 - 2⁶ = 51321383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51321447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321449) 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, 5947 + ... + 11747.

It is an arithmetic number, because the mean of its divisors is an integer number (6184932).

Almost surely, 2^51321447 is an apocalyptic number.

51321447 is a deficient number, since it is larger than the sum of its proper divisors (22897737).

51321447 is a wasteful number, since it uses less digits than its factorization.

51321447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790 (or 6787 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 51321447 is about 7163.8988686329. The cubic root of 51321447 is about 371.6204722718.

The spelling of 51321447 in words is "fifty-one million, three hundred twenty-one thousand, four hundred forty-seven".