191213656 has 16 divisors (see below), whose sum is σ = 359564040. Its totient is φ = 95329920.

The previous prime is 191213653. The next prime is 191213683. The reversal of 191213656 is 656312191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191213653) 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 3 ways as a sum of consecutive naturals, for example, 31665 + ... + 37216.

Almost surely, 2^191213656 is an apocalyptic number.

It is an amenable number.

191213656 is a deficient number, since it is larger than the sum of its proper divisors (168350384).

191213656 is a wasteful number, since it uses less digits than its factorization.

191213656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69234 (or 69230 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 191213656 is about 13828.0026034131. The cubic root of 191213656 is about 576.1111780635. Note that the first 4 decimals are identical.

The spelling of 191213656 in words is "one hundred ninety-one million, two hundred thirteen thousand, six hundred fifty-six".