191721014 has 4 divisors (see below), whose sum is σ = 287581524. Its totient is φ = 95860506.

The previous prime is 191721011. The next prime is 191721017. The reversal of 191721014 is 410127191.

191721014 is digitally balanced in base 3, 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.

It is an interprime number because it is at equal distance from previous prime (191721011) and next prime (191721017).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191721011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47930252 + ... + 47930255.

It is an arithmetic number, because the mean of its divisors is an integer number (71895381).

Almost surely, 2^191721014 is an apocalyptic number.

191721014 is a deficient number, since it is larger than the sum of its proper divisors (95860510).

191721014 is an equidigital number, since it uses as much as digits as its factorization.

191721014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95860509.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 191721014 is about 13846.3357607708. The cubic root of 191721014 is about 576.6202708431.

The spelling of 191721014 in words is "one hundred ninety-one million, seven hundred twenty-one thousand, fourteen".