191426491 has 4 divisors (see below), whose sum is σ = 192803800. Its totient is φ = 190049184.

The previous prime is 191426483. The next prime is 191426527. The reversal of 191426491 is 194624191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194624191 = 29 ⋅6711179.

It is a cyclic number.

It is not a de Polignac number, because 191426491 - 2³ = 191426483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191426491.

It is not an unprimeable number, because it can be changed into a prime (191426461) 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 3 ways as a sum of consecutive naturals, for example, 688446 + ... + 688723.

It is an arithmetic number, because the mean of its divisors is an integer number (48200950).

Almost surely, 2^191426491 is an apocalyptic number.

191426491 is a deficient number, since it is larger than the sum of its proper divisors (1377309).

191426491 is a wasteful number, since it uses less digits than its factorization.

191426491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377308.

The product of its digits is 15552, while the sum is 37.

The square root of 191426491 is about 13835.6962600369. The cubic root of 191426491 is about 576.3248503145.

The spelling of 191426491 in words is "one hundred ninety-one million, four hundred twenty-six thousand, four hundred ninety-one".