51388554 has 48 divisors (see below), whose sum is σ = 120788928. Its totient is φ = 14531328.

The previous prime is 51388543. The next prime is 51388591. The reversal of 51388554 is 45588315.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29434 + ... + 31130.

It is an arithmetic number, because the mean of its divisors is an integer number (2516436).

Almost surely, 2^51388554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51388554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60394464).

51388554 is an abundant number, since it is smaller than the sum of its proper divisors (69400374).

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

51388554 is a wasteful number, since it uses less digits than its factorization.

51388554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819 (or 1812 counting only the distinct ones).

The product of its digits is 96000, while the sum is 39.

The square root of 51388554 is about 7168.5810311386. The cubic root of 51388554 is about 371.7823764707.

The spelling of 51388554 in words is "fifty-one million, three hundred eighty-eight thousand, five hundred fifty-four".