191540449 has 2 divisors, whose sum is σ = 191540450. Its totient is φ = 191540448.

The previous prime is 191540443. The next prime is 191540467. The reversal of 191540449 is 944045191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191324224 + 216225 = 13832^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 191540449 - 2³ = 191540441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191540441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95770224 + 95770225.

It is an arithmetic number, because the mean of its divisors is an integer number (95770225).

Almost surely, 2^191540449 is an apocalyptic number.

It is an amenable number.

191540449 is a deficient number, since it is larger than the sum of its proper divisors (1).

191540449 is an equidigital number, since it uses as much as digits as its factorization.

191540449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 191540449 is about 13839.8139077084. The cubic root of 191540449 is about 576.4391915055.

The spelling of 191540449 in words is "one hundred ninety-one million, five hundred forty thousand, four hundred forty-nine".