51909219 has 12 divisors (see below), whose sum is σ = 75709296. Its totient is φ = 34269552.

The previous prime is 51909191. The next prime is 51909227. The reversal of 51909219 is 91290915.

It is not a de Polignac number, because 51909219 - 2⁹ = 51908707 is a prime.

It is a super-2 number, since 2×51909219² = 5389134034379922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51909019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27072 + ... + 28925.

It is an arithmetic number, because the mean of its divisors is an integer number (6309108).

Almost surely, 2^51909219 is an apocalyptic number.

51909219 is a deficient number, since it is larger than the sum of its proper divisors (23800077).

51909219 is a wasteful number, since it uses less digits than its factorization.

51909219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56106 (or 56103 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 51909219 is about 7204.8052714837. The cubic root of 51909219 is about 373.0337833302.

The spelling of 51909219 in words is "fifty-one million, nine hundred nine thousand, two hundred nineteen".