51982381 has 8 divisors (see below), whose sum is σ = 58537728. Its totient is φ = 45732000.

The previous prime is 51982361. The next prime is 51982387. The reversal of 51982381 is 18328915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51982381 - 2⁷ = 51982253 is a prime.

It is a super-2 number, since 2×51982381² = 5404335868858322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51982381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51982387) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 75880 + ... + 76561.

It is an arithmetic number, because the mean of its divisors is an integer number (7317216).

Almost surely, 2^51982381 is an apocalyptic number.

It is an amenable number.

51982381 is a deficient number, since it is larger than the sum of its proper divisors (6555347).

51982381 is a wasteful number, since it uses less digits than its factorization.

51982381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152483.

The product of its digits is 17280, while the sum is 37.

The square root of 51982381 is about 7209.8807895831. The cubic root of 51982381 is about 373.2089550773.

The spelling of 51982381 in words is "fifty-one million, nine hundred eighty-two thousand, three hundred eighty-one".