51891084 has 48 divisors (see below), whose sum is σ = 153753600. Its totient is φ = 14825808.

The previous prime is 51891083. The next prime is 51891113. The reversal of 51891084 is 48019815.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51891083) 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, 33564 + ... + 35075.

It is an arithmetic number, because the mean of its divisors is an integer number (3203200).

Almost surely, 2^51891084 is an apocalyptic number.

51891084 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51891084 is an abundant number, since it is smaller than the sum of its proper divisors (101862516).

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

51891084 is a wasteful number, since it uses less digits than its factorization.

51891084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68659 (or 68651 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 51891084 is about 7203.5466264889. The cubic root of 51891084 is about 372.9903372542.

The spelling of 51891084 in words is "fifty-one million, eight hundred ninety-one thousand, eighty-four".