51851409 has 8 divisors (see below), whose sum is σ = 69769920. Its totient is φ = 34250256.

The previous prime is 51851381. The next prime is 51851417. The reversal of 51851409 is 90415815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51851409 - 2⁸ = 51851153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51851409.

It is not an unprimeable number, because it can be changed into a prime (51851419) 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 7 ways as a sum of consecutive naturals, for example, 78957 + ... + 79610.

It is an arithmetic number, because the mean of its divisors is an integer number (8721240).

Almost surely, 2^51851409 is an apocalyptic number.

It is an amenable number.

51851409 is a deficient number, since it is larger than the sum of its proper divisors (17918511).

51851409 is a wasteful number, since it uses less digits than its factorization.

51851409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158679.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 51851409 is about 7200.7922480794. The cubic root of 51851409 is about 372.8952524238.

The spelling of 51851409 in words is "fifty-one million, eight hundred fifty-one thousand, four hundred nine".