51609219 has 4 divisors (see below), whose sum is σ = 68812296. Its totient is φ = 34406144.

The previous prime is 51609193. The next prime is 51609251. The reversal of 51609219 is 91290615.

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 51609219 - 2⁷ = 51609091 is a prime.

It is a super-2 number, since 2×51609219² = 5327022971579922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51609219.

It is not an unprimeable number, because it can be changed into a prime (51609269) 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, 8601534 + ... + 8601539.

It is an arithmetic number, because the mean of its divisors is an integer number (17203074).

Almost surely, 2^51609219 is an apocalyptic number.

51609219 is a deficient number, since it is larger than the sum of its proper divisors (17203077).

51609219 is a wasteful number, since it uses less digits than its factorization.

51609219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17203076.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 51609219 is about 7183.9556652307. The cubic root of 51609219 is about 372.3137672444.

The spelling of 51609219 in words is "fifty-one million, six hundred nine thousand, two hundred nineteen".