191323641 has 16 divisors (see below), whose sum is σ = 262570176. Its totient is φ = 123848256.

The previous prime is 191323621. The next prime is 191323669. The reversal of 191323641 is 146323191.

It is not a de Polignac number, because 191323641 - 2⁵ = 191323609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 191323599 and 191323608.

It is not an unprimeable number, because it can be changed into a prime (191323621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18031 + ... + 26603.

It is an arithmetic number, because the mean of its divisors is an integer number (16410636).

Almost surely, 2^191323641 is an apocalyptic number.

It is an amenable number.

191323641 is a deficient number, since it is larger than the sum of its proper divisors (71246535).

191323641 is a wasteful number, since it uses less digits than its factorization.

191323641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8792.

The product of its digits is 3888, while the sum is 30.

The square root of 191323641 is about 13831.9789256635. The cubic root of 191323641 is about 576.2216155088.

The spelling of 191323641 in words is "one hundred ninety-one million, three hundred twenty-three thousand, six hundred forty-one".