193090661 has 4 divisors (see below), whose sum is σ = 199319424. Its totient is φ = 186861900.

The previous prime is 193090643. The next prime is 193090697. The reversal of 193090661 is 166090391.

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 a cyclic number.

It is not a de Polignac number, because 193090661 - 2²⁶ = 125981797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193090561) 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, 3114335 + ... + 3114396.

It is an arithmetic number, because the mean of its divisors is an integer number (49829856).

Almost surely, 2^193090661 is an apocalyptic number.

It is an amenable number.

193090661 is a deficient number, since it is larger than the sum of its proper divisors (6228763).

193090661 is an equidigital number, since it uses as much as digits as its factorization.

193090661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228762.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 193090661 is about 13895.7065671379. The cubic root of 193090661 is about 577.9901310560.

The spelling of 193090661 in words is "one hundred ninety-three million, ninety thousand, six hundred sixty-one".