193440081 has 4 divisors (see below), whose sum is σ = 257920112. Its totient is φ = 128960052.

The previous prime is 193440047. The next prime is 193440131. The reversal of 193440081 is 180044391.

It is a happy number.

193440081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 193440081 - 2⁶ = 193440017 is a prime.

It is a super-2 number, since 2×193440081² = 74838129874573122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (193441081) 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, 32240011 + ... + 32240016.

It is an arithmetic number, because the mean of its divisors is an integer number (64480028).

Almost surely, 2^193440081 is an apocalyptic number.

It is an amenable number.

193440081 is a deficient number, since it is larger than the sum of its proper divisors (64480031).

193440081 is an equidigital number, since it uses as much as digits as its factorization.

193440081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64480030.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 193440081 is about 13908.2738325070. The cubic root of 193440081 is about 578.3385677415.

The spelling of 193440081 in words is "one hundred ninety-three million, four hundred forty thousand, eighty-one".