51247389 has 16 divisors (see below), whose sum is σ = 72161280. Its totient is φ = 32261040.

The previous prime is 51247373. The next prime is 51247393. The reversal of 51247389 is 98374215.

It is not a de Polignac number, because 51247389 - 2⁴ = 51247373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51247349) 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, 18484 + ... + 21074.

It is an arithmetic number, because the mean of its divisors is an integer number (4510080).

Almost surely, 2^51247389 is an apocalyptic number.

It is an amenable number.

51247389 is a deficient number, since it is larger than the sum of its proper divisors (20913891).

51247389 is a wasteful number, since it uses less digits than its factorization.

51247389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2960.

The product of its digits is 60480, while the sum is 39.

The square root of 51247389 is about 7158.7281691652. The cubic root of 51247389 is about 371.4416339940.

The spelling of 51247389 in words is "fifty-one million, two hundred forty-seven thousand, three hundred eighty-nine".