51228381 has 8 divisors (see below), whose sum is σ = 68508544. Its totient is φ = 34050240.

The previous prime is 51228341. The next prime is 51228391. The reversal of 51228381 is 18382215.

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

It is not a de Polignac number, because 51228381 - 2¹¹ = 51226333 is a prime.

It is a super-2 number, since 2×51228381² = 5248694039762322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51228341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24325 + ... + 26346.

It is an arithmetic number, because the mean of its divisors is an integer number (8563568).

Almost surely, 2^51228381 is an apocalyptic number.

It is an amenable number.

51228381 is a deficient number, since it is larger than the sum of its proper divisors (17280163).

51228381 is a wasteful number, since it uses less digits than its factorization.

51228381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51011.

The product of its digits is 3840, while the sum is 30.

The square root of 51228381 is about 7157.4004359125. The cubic root of 51228381 is about 371.3957049180.

The spelling of 51228381 in words is "fifty-one million, two hundred twenty-eight thousand, three hundred eighty-one".