191957212 has 24 divisors (see below), whose sum is σ = 343768320. Its totient is φ = 93746160.

The previous prime is 191957201. The next prime is 191957219. The reversal of 191957212 is 212759191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191957219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151839 + ... + 153097.

It is an arithmetic number, because the mean of its divisors is an integer number (14323680).

Almost surely, 2^191957212 is an apocalyptic number.

It is an amenable number.

191957212 is a deficient number, since it is larger than the sum of its proper divisors (151811108).

191957212 is a wasteful number, since it uses less digits than its factorization.

191957212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2119 counting only the distinct ones).

The product of its digits is 11340, while the sum is 37.

The square root of 191957212 is about 13854.8623955635. The cubic root of 191957212 is about 576.8569700956.

It can be divided in two parts, 19 and 1957212, that added together give a triangular number (1957231 = T₁₉₇₈).

The spelling of 191957212 in words is "one hundred ninety-one million, nine hundred fifty-seven thousand, two hundred twelve".