181958401 has 4 divisors (see below), whose sum is σ = 182037204. Its totient is φ = 181879600.

The previous prime is 181958351. The next prime is 181958407. The reversal of 181958401 is 104859181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2371600 + 179586801 = 1540^2 + 13401^2 .

It is a cyclic number.

It is not a de Polignac number, because 181958401 - 2¹⁷ = 181827329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181958407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35830 + ... + 40591.

It is an arithmetic number, because the mean of its divisors is an integer number (45509301).

Almost surely, 2^181958401 is an apocalyptic number.

It is an amenable number.

181958401 is a deficient number, since it is larger than the sum of its proper divisors (78803).

181958401 is an equidigital number, since it uses as much as digits as its factorization.

181958401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78802.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 181958401 is about 13489.1957136072. The cubic root of 181958401 is about 566.6619310254.

The spelling of 181958401 in words is "one hundred eighty-one million, nine hundred fifty-eight thousand, four hundred one".