51033381 has 16 divisors (see below), whose sum is σ = 78538368. Its totient is φ = 28872000.

The previous prime is 51033377. The next prime is 51033383. The reversal of 51033381 is 18333015.

It is not a de Polignac number, because 51033381 - 2² = 51033377 is a prime.

It is a super-2 number, since 2×51033381² = 5208811952582322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51033383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9910 + ... + 14151.

It is an arithmetic number, because the mean of its divisors is an integer number (4908648).

Almost surely, 2^51033381 is an apocalyptic number.

It is an amenable number.

51033381 is a deficient number, since it is larger than the sum of its proper divisors (27504987).

51033381 is a wasteful number, since it uses less digits than its factorization.

51033381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24172.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51033381 is about 7143.7651837109. The cubic root of 51033381 is about 370.9238684924.

Adding to 51033381 its reverse (18333015), we get a palindrome (69366396).

The spelling of 51033381 in words is "fifty-one million, thirty-three thousand, three hundred eighty-one".