147809331981 has 8 divisors (see below), whose sum is σ = 218976788160. Its totient is φ = 98539554636.

The previous prime is 147809331959. The next prime is 147809331997. The reversal of 147809331981 is 189133908741.

It is a happy number.

147809331981 is a `hidden beast` number, since 1 + 478 + 0 + 93 + 3 + 1 + 9 + 81 = 666.

147809331981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 147809331981 - 2⁵ = 147809331949 is a prime.

It is a super-2 number, since 2×147809331981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147809331781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2737209825 + ... + 2737209878.

It is an arithmetic number, because the mean of its divisors is an integer number (27372098520).

Almost surely, 2^147809331981 is an apocalyptic number.

It is an amenable number.

147809331981 is a deficient number, since it is larger than the sum of its proper divisors (71167456179).

147809331981 is an equidigital number, since it uses as much as digits as its factorization.

147809331981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474419712 (or 5474419706 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 147809331981 in words is "one hundred forty-seven billion, eight hundred nine million, three hundred thirty-one thousand, nine hundred eighty-one".