51909091 has 16 divisors (see below), whose sum is σ = 58834944. Its totient is φ = 45438624.

The previous prime is 51909089. The next prime is 51909131. The reversal of 51909091 is 19090915.

It is a cyclic number.

It is not a de Polignac number, because 51909091 - 2¹ = 51909089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51909001) 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 15 ways as a sum of consecutive naturals, for example, 37290 + ... + 38656.

It is an arithmetic number, because the mean of its divisors is an integer number (3677184).

Almost surely, 2^51909091 is an apocalyptic number.

51909091 is a deficient number, since it is larger than the sum of its proper divisors (6925853).

51909091 is a wasteful number, since it uses less digits than its factorization.

51909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 51909091 is about 7204.7963885179. The cubic root of 51909091 is about 373.0334767156.

The spelling of 51909091 in words is "fifty-one million, nine hundred nine thousand, ninety-one".