51843381 has 24 divisors (see below), whose sum is σ = 74705760. Its totient is φ = 31880160.

The previous prime is 51843367. The next prime is 51843413. The reversal of 51843381 is 18334815.

It is a de Polignac number, because none of the positive numbers 2^k-51843381 is a prime.

It is a super-2 number, since 2×51843381² = 5375472307022322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51843361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395686 + ... + 395816.

It is an arithmetic number, because the mean of its divisors is an integer number (3112740).

Almost surely, 2^51843381 is an apocalyptic number.

It is an amenable number.

51843381 is a deficient number, since it is larger than the sum of its proper divisors (22862379).

51843381 is a wasteful number, since it uses less digits than its factorization.

51843381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 206 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 51843381 is about 7200.2347878385. The cubic root of 51843381 is about 372.8760066749.

The spelling of 51843381 in words is "fifty-one million, eight hundred forty-three thousand, three hundred eighty-one".