51609000 has 64 divisors (see below), whose sum is σ = 161029440. Its totient is φ = 13761600.

The previous prime is 51608971. The next prime is 51609001. The reversal of 51609000 is 90615.

It is not an unprimeable number, because it can be changed into a prime (51609001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5602 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (2516085).

Almost surely, 2^51609000 is an apocalyptic number.

51609000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51609000 is an abundant number, since it is smaller than the sum of its proper divisors (109420440).

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

51609000 is a wasteful number, since it uses less digits than its factorization.

51609000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227 (or 17213 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 51609000 is about 7183.9404229155. The cubic root of 51609000 is about 372.3132406148.

Adding to 51609000 its reverse (90615), we get a palindrome (51699615).

The spelling of 51609000 in words is "fifty-one million, six hundred nine thousand".