51349181 has 16 divisors (see below), whose sum is σ = 57228864. Its totient is φ = 45771264.

The previous prime is 51349159. The next prime is 51349183. The reversal of 51349181 is 18194315.

It is a de Polignac number, because none of the positive numbers 2^k-51349181 is a prime.

It is a super-2 number, since 2×51349181² = 5273476778741522, 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 (51349183) 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, 53750 + ... + 54696.

It is an arithmetic number, because the mean of its divisors is an integer number (3576804).

Almost surely, 2^51349181 is an apocalyptic number.

It is an amenable number.

51349181 is a deficient number, since it is larger than the sum of its proper divisors (5879683).

51349181 is a wasteful number, since it uses less digits than its factorization.

51349181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its digits is 4320, while the sum is 32.

The square root of 51349181 is about 7165.8342849943. The cubic root of 51349181 is about 371.6874011862.

It can be divided in two parts, 513 and 49181, that added together give a palindrome (49694).

The spelling of 51349181 in words is "fifty-one million, three hundred forty-nine thousand, one hundred eighty-one".