51847213 has 16 divisors (see below), whose sum is σ = 58046976. Its totient is φ = 45912240.

The previous prime is 51847199. The next prime is 51847307. The reversal of 51847213 is 31274815.

It is not a de Polignac number, because 51847213 - 2⁹ = 51846701 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 (51847013) 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 15 ways as a sum of consecutive naturals, for example, 75570 + ... + 76252.

It is an arithmetic number, because the mean of its divisors is an integer number (3627936).

Almost surely, 2^51847213 is an apocalyptic number.

It is an amenable number.

51847213 is a deficient number, since it is larger than the sum of its proper divisors (6199763).

51847213 is a wasteful number, since it uses less digits than its factorization.

51847213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its digits is 6720, while the sum is 31.

The square root of 51847213 is about 7200.5008853551. The cubic root of 51847213 is about 372.8851934835.

The spelling of 51847213 in words is "fifty-one million, eight hundred forty-seven thousand, two hundred thirteen".