51609599 has 4 divisors (see below), whose sum is σ = 52455720. Its totient is φ = 50763480.

The previous prime is 51609541. The next prime is 51609617. The reversal of 51609599 is 99590615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51609599 - 2⁸ = 51609343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51609499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422969 + ... + 423090.

It is an arithmetic number, because the mean of its divisors is an integer number (13113930).

Almost surely, 2^51609599 is an apocalyptic number.

51609599 is a deficient number, since it is larger than the sum of its proper divisors (846121).

51609599 is an equidigital number, since it uses as much as digits as its factorization.

51609599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846120.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 51609599 is about 7183.9821130067. The cubic root of 51609599 is about 372.3146810274.

The spelling of 51609599 in words is "fifty-one million, six hundred nine thousand, five hundred ninety-nine".