51480009 has 16 divisors (see below), whose sum is σ = 87162240. Its totient is φ = 29417040.

The previous prime is 51480001. The next prime is 51480019. The reversal of 51480009 is 90008415.

It is not a de Polignac number, because 51480009 - 2³ = 51480001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51480001) 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 15 ways as a sum of consecutive naturals, for example, 136002 + ... + 136379.

It is an arithmetic number, because the mean of its divisors is an integer number (5447640).

Almost surely, 2^51480009 is an apocalyptic number.

It is an amenable number.

51480009 is a deficient number, since it is larger than the sum of its proper divisors (35682231).

51480009 is a wasteful number, since it uses less digits than its factorization.

51480009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272397 (or 272391 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51480009 is about 7174.9570730423. The cubic root of 51480009 is about 372.0027965451.

The spelling of 51480009 in words is "fifty-one million, four hundred eighty thousand, nine".