51480181 has 16 divisors (see below), whose sum is σ = 55019520. Its totient is φ = 48090240.

The previous prime is 51480167. The next prime is 51480193. The reversal of 51480181 is 18108415.

It is a cyclic number.

It is not a de Polignac number, because 51480181 - 2¹⁹ = 50955893 is a prime.

It is a super-2 number, since 2×51480181² = 5300418071585522, 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 (51480151) 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, 129475 + ... + 129871.

It is an arithmetic number, because the mean of its divisors is an integer number (3438720).

Almost surely, 2^51480181 is an apocalyptic number.

It is an amenable number.

51480181 is a deficient number, since it is larger than the sum of its proper divisors (3539339).

51480181 is a wasteful number, since it uses less digits than its factorization.

51480181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 51480181 is about 7174.9690591667. The cubic root of 51480181 is about 372.0032108444.

Adding to 51480181 its reverse (18108415), we get a palindrome (69588596).

The spelling of 51480181 in words is "fifty-one million, four hundred eighty thousand, one hundred eighty-one".