51971544 has 80 divisors (see below), whose sum is σ = 146869800. Its totient is φ = 17169408.

The previous prime is 51971539. The next prime is 51971551. The reversal of 51971544 is 44517915.

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

It is a junction number, because it is equal to n+sod(n) for n = 51971499 and 51971508.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 89784 + ... + 90360.

Almost surely, 2^51971544 is an apocalyptic number.

51971544 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 51971544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73434900).

51971544 is an abundant number, since it is smaller than the sum of its proper divisors (94898256).

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

51971544 is a wasteful number, since it uses less digits than its factorization.

51971544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 721 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51971544 is about 7209.1292123252. The cubic root of 51971544 is about 373.1830184269.

The spelling of 51971544 in words is "fifty-one million, nine hundred seventy-one thousand, five hundred forty-four".