191142919 has 4 divisors (see below), whose sum is σ = 208519560. Its totient is φ = 173766280.

The previous prime is 191142871. The next prime is 191142929. The reversal of 191142919 is 919241191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919241191 = 11 ⋅83567381.

It is a cyclic number.

It is not a de Polignac number, because 191142919 - 2¹¹ = 191140871 is a prime.

It is a super-2 number, since 2×191142919² = 73071230967681122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191142929) 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, 8688304 + ... + 8688325.

It is an arithmetic number, because the mean of its divisors is an integer number (52129890).

Almost surely, 2^191142919 is an apocalyptic number.

191142919 is a deficient number, since it is larger than the sum of its proper divisors (17376641).

191142919 is a wasteful number, since it uses less digits than its factorization.

191142919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17376640.

The product of its digits is 5832, while the sum is 37.

The square root of 191142919 is about 13825.4446221451. Note that the first 3 decimals coincide. The cubic root of 191142919 is about 576.0401276940.

It can be divided in two parts, 19114 and 2919, that multiplied together give a triangular number (55793766 = T₁₀₅₆₃).

The spelling of 191142919 in words is "one hundred ninety-one million, one hundred forty-two thousand, nine hundred nineteen".