51168213 has 8 divisors (see below), whose sum is σ = 75804800. Its totient is φ = 34112124.

The previous prime is 51168199. The next prime is 51168233. The reversal of 51168213 is 31286115.

51168213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51168213 - 2⁸ = 51167957 is a prime.

It is a super-2 number, since 2×51168213² = 5236372043226738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1895119 = 51168213 / (5 + 1 + 1 + 6 + 8 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51168233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947533 + ... + 947586.

It is an arithmetic number, because the mean of its divisors is an integer number (9475600).

Almost surely, 2^51168213 is an apocalyptic number.

It is an amenable number.

51168213 is a deficient number, since it is larger than the sum of its proper divisors (24636587).

51168213 is a wasteful number, since it uses less digits than its factorization.

51168213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895128 (or 1895122 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 51168213 is about 7153.1959989923. The cubic root of 51168213 is about 371.2502458931.

The spelling of 51168213 in words is "fifty-one million, one hundred sixty-eight thousand, two hundred thirteen".