191344641 has 4 divisors (see below), whose sum is σ = 255126192. Its totient is φ = 127563092.

The previous prime is 191344627. The next prime is 191344651. The reversal of 191344641 is 146443191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 146443191 = 3 ⋅48814397.

It is a cyclic number.

It is not a de Polignac number, because 191344641 - 2¹⁴ = 191328257 is a prime.

It is a super-2 number, since 2×191344641² = 73225543278837762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191344651) 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, 31890771 + ... + 31890776.

It is an arithmetic number, because the mean of its divisors is an integer number (63781548).

Almost surely, 2^191344641 is an apocalyptic number.

It is an amenable number.

191344641 is a deficient number, since it is larger than the sum of its proper divisors (63781551).

191344641 is an equidigital number, since it uses as much as digits as its factorization.

191344641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63781550.

The product of its digits is 10368, while the sum is 33.

The square root of 191344641 is about 13832.7380153027. The cubic root of 191344641 is about 576.2426970840.

The spelling of 191344641 in words is "one hundred ninety-one million, three hundred forty-four thousand, six hundred forty-one".