181739363481 has 81 divisors (see below), whose sum is σ = 302434064829. Its totient is φ = 105097105152.

The previous prime is 181739363473. The next prime is 181739363527. The reversal of 181739363481 is 184363937181.

The square root of 181739363481 is 426309.

It is a perfect power (a square), and thus also a powerful number.

181739363481 is a `hidden beast` number, since 1 + 8 + 1 + 73 + 93 + 6 + 3 + 481 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1640979081 + 180098384400 = 40509^2 + 424380^2 .

It is not a de Polignac number, because 181739363481 - 2³ = 181739363473 is a prime.

It is a super-2 number, since 2×181739363481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181739363681) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 282642546 + ... + 282643188.

Almost surely, 2^181739363481 is an apocalyptic number.

181739363481 is the 426309-th square number.

181739363481 is the 213155-th centered octagonal number.

It is an amenable number.

181739363481 is a deficient number, since it is larger than the sum of its proper divisors (120694701348).

181739363481 is an equidigital number, since it uses as much as digits as its factorization.

181739363481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352 (or 676 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 181739363481 in words is "one hundred eighty-one billion, seven hundred thirty-nine million, three hundred sixty-three thousand, four hundred eighty-one".