191010491 has 16 divisors (see below), whose sum is σ = 223534080. Its totient is φ = 159815040.

The previous prime is 191010481. The next prime is 191010497. The reversal of 191010491 is 194010191.

It is not a de Polignac number, because 191010491 - 2¹⁴ = 190994107 is a prime.

It is a super-2 number, since 2×191010491² = 72970015344122162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191010491.

It is not an unprimeable number, because it can be changed into a prime (191010497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216371 + ... + 217251.

It is an arithmetic number, because the mean of its divisors is an integer number (13970880).

Almost surely, 2^191010491 is an apocalyptic number.

191010491 is a deficient number, since it is larger than the sum of its proper divisors (32523589).

191010491 is an equidigital number, since it uses as much as digits as its factorization.

191010491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 191010491 is about 13820.6545069327. The cubic root of 191010491 is about 575.9070658883.

The spelling of 191010491 in words is "one hundred ninety-one million, ten thousand, four hundred ninety-one".