51009320 has 32 divisors (see below), whose sum is σ = 116941320. Its totient is φ = 20017920.

The previous prime is 51009317. The next prime is 51009323. The reversal of 51009320 is 2390015.

It is an interprime number because it is at equal distance from previous prime (51009317) and next prime (51009323).

It can be written as a sum of positive squares in 4 ways, for example, as 51008164 + 1156 = 7142^2 + 34^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51009292 and 51009301.

It is not an unprimeable number, because it can be changed into a prime (51009323) 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, 9911 + ... + 14150.

Almost surely, 2^51009320 is an apocalyptic number.

It is an amenable number.

51009320 is an abundant number, since it is smaller than the sum of its proper divisors (65932000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51009320 is a wasteful number, since it uses less digits than its factorization.

51009320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24125 (or 24121 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 51009320 is about 7142.0809292530. The cubic root of 51009320 is about 370.8655654628.

Adding to 51009320 its reverse (2390015), we get a palindrome (53399335).

The spelling of 51009320 in words is "fifty-one million, nine thousand, three hundred twenty".