180981953 has 4 divisors (see below), whose sum is σ = 187222740. Its totient is φ = 174741168.

The previous prime is 180981919. The next prime is 180981959. The reversal of 180981953 is 359189081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 359189081 = 37 ⋅9707813.

It can be written as a sum of positive squares in 2 ways, for example, as 41576704 + 139405249 = 6448^2 + 11807^2 .

It is a cyclic number.

It is not a de Polignac number, because 180981953 - 2²² = 176787649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (180981959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3120350 + ... + 3120407.

It is an arithmetic number, because the mean of its divisors is an integer number (46805685).

Almost surely, 2^180981953 is an apocalyptic number.

It is an amenable number.

180981953 is a deficient number, since it is larger than the sum of its proper divisors (6240787).

180981953 is an equidigital number, since it uses as much as digits as its factorization.

180981953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6240786.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 180981953 is about 13452.9533188813. The cubic root of 180981953 is about 565.6464816603.

The spelling of 180981953 in words is "one hundred eighty million, nine hundred eighty-one thousand, nine hundred fifty-three".