51091884 has 60 divisors (see below), whose sum is σ = 135506448. Its totient is φ = 16783200.

The previous prime is 51091877. The next prime is 51091891. The reversal of 51091884 is 48819015.

51091884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51091877) and next prime (51091891).

It is a super-2 number, since 2×51091884² = 5220761221338912, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21894 + ... + 24114.

Almost surely, 2^51091884 is an apocalyptic number.

51091884 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51091884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67753224).

51091884 is an abundant number, since it is smaller than the sum of its proper divisors (84414564).

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

51091884 is a wasteful number, since it uses less digits than its factorization.

51091884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308 (or 2297 counting only the distinct ones).

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

The square root of 51091884 is about 7147.8587003382. The cubic root of 51091884 is about 371.0655526986.

The spelling of 51091884 in words is "fifty-one million, ninety-one thousand, eight hundred eighty-four".