51036381 has 12 divisors (see below), whose sum is σ = 80421120. Its totient is φ = 30931080.

The previous prime is 51036371. The next prime is 51036383. The reversal of 51036381 is 18363015.

It is not a de Polignac number, because 51036381 - 2⁷ = 51036253 is a prime.

It is a super-2 number, since 2×51036381² = 5209424371154322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51036383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257661 + ... + 257858.

It is an arithmetic number, because the mean of its divisors is an integer number (6701760).

Almost surely, 2^51036381 is an apocalyptic number.

It is an amenable number.

51036381 is a deficient number, since it is larger than the sum of its proper divisors (29384739).

51036381 is a wasteful number, since it uses less digits than its factorization.

51036381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515536 (or 515533 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51036381 is about 7143.9751539322. The cubic root of 51036381 is about 370.9311366097.

Adding to 51036381 its reverse (18363015), we get a palindrome (69399396).

The spelling of 51036381 in words is "fifty-one million, thirty-six thousand, three hundred eighty-one".