181954639096129 has 4 divisors (see below), whose sum is σ = 182045935956676. Its totient is φ = 181863342235584.

The previous prime is 181954639096117. The next prime is 181954639096141. The reversal of 181954639096129 is 921690936459181.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (181954639096117) and next prime (181954639096141).

It can be written as a sum of positive squares in 2 ways, for example, as 133524842537025 + 48429796559104 = 11555295^2 + 6959152^2 .

It is a cyclic number.

It is not a de Polignac number, because 181954639096129 - 2⁷ = 181954639096001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181954639096429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45648427284 + ... + 45648431269.

It is an arithmetic number, because the mean of its divisors is an integer number (45511483989169).

Almost surely, 2^{181954639096129} is an apocalyptic number.

It is an amenable number.

181954639096129 is a deficient number, since it is larger than the sum of its proper divisors (91296860547).

181954639096129 is an equidigital number, since it uses as much as digits as its factorization.

181954639096129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91296860546.

The product of its (nonzero) digits is 226748160, while the sum is 73.

The spelling of 181954639096129 in words is "one hundred eighty-one trillion, nine hundred fifty-four billion, six hundred thirty-nine million, ninety-six thousand, one hundred twenty-nine".