51667389 has 24 divisors (see below), whose sum is σ = 77968800. Its totient is φ = 34189776.

The previous prime is 51667379. The next prime is 51667391. The reversal of 51667389 is 98376615.

It is a happy number.

51667389 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 51667389 - 2⁷ = 51667261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51667379) 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 23 ways as a sum of consecutive naturals, for example, 35494 + ... + 36920.

It is an arithmetic number, because the mean of its divisors is an integer number (3248700).

Almost surely, 2^51667389 is an apocalyptic number.

It is an amenable number.

51667389 is a deficient number, since it is larger than the sum of its proper divisors (26301411).

51667389 is a wasteful number, since it uses less digits than its factorization.

51667389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1579 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 51667389 is about 7188.0031302163. The cubic root of 51667389 is about 372.4535960092.

Subtracting from 51667389 its sum of digits (45), we obtain a square (51667344 = 7188²).

The spelling of 51667389 in words is "fifty-one million, six hundred sixty-seven thousand, three hundred eighty-nine".