51709189 has 16 divisors (see below), whose sum is σ = 62764416. Its totient is φ = 41587200.

The previous prime is 51709183. The next prime is 51709211. The reversal of 51709189 is 98190715.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51709189 - 2⁵ = 51709157 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 (51709183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67569 + ... + 68329.

It is an arithmetic number, because the mean of its divisors is an integer number (3922776).

Almost surely, 2^51709189 is an apocalyptic number.

It is an amenable number.

51709189 is a deficient number, since it is larger than the sum of its proper divisors (11055227).

51709189 is a wasteful number, since it uses less digits than its factorization.

51709189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 51709189 is about 7190.9101649235. The cubic root of 51709189 is about 372.5540098555.

The spelling of 51709189 in words is "fifty-one million, seven hundred nine thousand, one hundred eighty-nine".