51376809 has 8 divisors (see below), whose sum is σ = 74729952. Its totient is φ = 31137440.

The previous prime is 51376789. The next prime is 51376811. The reversal of 51376809 is 90867315.

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

It is a cyclic number.

It is not a de Polignac number, because 51376809 - 2⁷ = 51376681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51376879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778404 + ... + 778469.

It is an arithmetic number, because the mean of its divisors is an integer number (9341244).

Almost surely, 2^51376809 is an apocalyptic number.

It is an amenable number.

51376809 is a deficient number, since it is larger than the sum of its proper divisors (23353143).

51376809 is a wasteful number, since it uses less digits than its factorization.

51376809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556887.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 51376809 is about 7167.7617845461. The cubic root of 51376809 is about 371.7540503398.

The spelling of 51376809 in words is "fifty-one million, three hundred seventy-six thousand, eight hundred nine".