181406747481 has 4 divisors (see below), whose sum is σ = 241875663312. Its totient is φ = 120937831652.

The previous prime is 181406747471. The next prime is 181406747503. The reversal of 181406747481 is 184747604181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181406747481 - 2¹¹ = 181406745433 is a prime.

It is a super-2 number, since 2×181406747481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181406747471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30234457911 + ... + 30234457916.

It is an arithmetic number, because the mean of its divisors is an integer number (60468915828).

Almost surely, 2^181406747481 is an apocalyptic number.

It is an amenable number.

181406747481 is a deficient number, since it is larger than the sum of its proper divisors (60468915831).

181406747481 is an equidigital number, since it uses as much as digits as its factorization.

181406747481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60468915830.

The product of its (nonzero) digits is 1204224, while the sum is 51.

The spelling of 181406747481 in words is "one hundred eighty-one billion, four hundred six million, seven hundred forty-seven thousand, four hundred eighty-one".