191491449 has 4 divisors (see below), whose sum is σ = 255321936. Its totient is φ = 127660964.

The previous prime is 191491441. The next prime is 191491453. The reversal of 191491449 is 944194191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191491449 - 2³ = 191491441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191491449.

It is not an unprimeable number, because it can be changed into a prime (191491441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31915239 + ... + 31915244.

It is an arithmetic number, because the mean of its divisors is an integer number (63830484).

Almost surely, 2^191491449 is an apocalyptic number.

It is an amenable number.

191491449 is a deficient number, since it is larger than the sum of its proper divisors (63830487).

191491449 is an equidigital number, since it uses as much as digits as its factorization.

191491449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63830486.

The product of its digits is 46656, while the sum is 42.

The square root of 191491449 is about 13838.0435394603. The cubic root of 191491449 is about 576.3900322992.

The spelling of 191491449 in words is "one hundred ninety-one million, four hundred ninety-one thousand, four hundred forty-nine".