51362381 has 32 divisors (see below), whose sum is σ = 65028096. Its totient is φ = 39600000.

The previous prime is 51362371. The next prime is 51362407. The reversal of 51362381 is 18326315.

It is a cyclic number.

It is not a de Polignac number, because 51362381 - 2⁶ = 51362317 is a prime.

It is a super-2 number, since 2×51362381² = 5276188363978322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51362341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204506 + ... + 204756.

It is an arithmetic number, because the mean of its divisors is an integer number (2032128).

Almost surely, 2^51362381 is an apocalyptic number.

It is an amenable number.

51362381 is a deficient number, since it is larger than the sum of its proper divisors (13665715).

51362381 is a wasteful number, since it uses less digits than its factorization.

51362381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its digits is 4320, while the sum is 29.

The square root of 51362381 is about 7166.7552630183. The cubic root of 51362381 is about 371.7192475451.

Adding to 51362381 its reverse (18326315), we get a palindrome (69688696).

The spelling of 51362381 in words is "fifty-one million, three hundred sixty-two thousand, three hundred eighty-one".