51381772 has 12 divisors (see below), whose sum is σ = 96834976. Its totient is φ = 23714640.

The previous prime is 51381749. The next prime is 51381797. The reversal of 51381772 is 27718315.

It is a hoax number, since the sum of its digits (34) 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 3 ways as a sum of consecutive naturals, for example, 494004 + ... + 494107.

Almost surely, 2^51381772 is an apocalyptic number.

51381772 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51381772 is a deficient number, since it is larger than the sum of its proper divisors (45453204).

51381772 is a wasteful number, since it uses less digits than its factorization.

51381772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988128 (or 988126 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 51381772 is about 7168.1079790974. The cubic root of 51381772 is about 371.7660204354.

The spelling of 51381772 in words is "fifty-one million, three hundred eighty-one thousand, seven hundred seventy-two".