51427181 has 8 divisors (see below), whose sum is σ = 55892760. Its totient is φ = 47034432.

The previous prime is 51427177. The next prime is 51427199. The reversal of 51427181 is 18172415.

It can be written as a sum of positive squares in 4 ways, for example, as 75625 + 51351556 = 275^2 + 7166^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51427181 - 2² = 51427177 is a prime.

It is a super-2 number, since 2×51427181² = 5289509891213522, 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 (51427681) 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, 16730 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (6986595).

Almost surely, 2^51427181 is an apocalyptic number.

It is an amenable number.

51427181 is a deficient number, since it is larger than the sum of its proper divisors (4465579).

51427181 is a wasteful number, since it uses less digits than its factorization.

51427181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36415.

The product of its digits is 2240, while the sum is 29.

The square root of 51427181 is about 7171.2747123507. The cubic root of 51427181 is about 371.8755051284.

Adding to 51427181 its reverse (18172415), we get a palindrome (69599596).

The spelling of 51427181 in words is "fifty-one million, four hundred twenty-seven thousand, one hundred eighty-one".