51385009 has 8 divisors (see below), whose sum is σ = 55403712. Its totient is φ = 47375760.

The previous prime is 51384989. The next prime is 51385021. The reversal of 51385009 is 90058315.

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 51385009 - 2²¹ = 49287857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51385039) 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, 12372 + ... + 15994.

It is an arithmetic number, because the mean of its divisors is an integer number (6925464).

Almost surely, 2^51385009 is an apocalyptic number.

It is an amenable number.

51385009 is a deficient number, since it is larger than the sum of its proper divisors (4018703).

51385009 is a wasteful number, since it uses less digits than its factorization.

51385009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51385009 is about 7168.3337673409. Note that the first 3 decimals coincide. The cubic root of 51385009 is about 371.7738272333.

The spelling of 51385009 in words is "fifty-one million, three hundred eighty-five thousand, nine".