191649849 has 4 divisors (see below), whose sum is σ = 255533136. Its totient is φ = 127766564.

The previous prime is 191649847. The next prime is 191649883. The reversal of 191649849 is 948946191.

191649849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 948946191 = 3 ⋅316315397.

It is a cyclic number.

It is not a de Polignac number, because 191649849 - 2¹ = 191649847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191649847) 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, 31941639 + ... + 31941644.

It is an arithmetic number, because the mean of its divisors is an integer number (63883284).

Almost surely, 2^191649849 is an apocalyptic number.

It is an amenable number.

191649849 is a deficient number, since it is larger than the sum of its proper divisors (63883287).

191649849 is an equidigital number, since it uses as much as digits as its factorization.

191649849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63883286.

The product of its digits is 559872, while the sum is 51.

The square root of 191649849 is about 13843.7657087947. The cubic root of 191649849 is about 576.5489167106.

The spelling of 191649849 in words is "one hundred ninety-one million, six hundred forty-nine thousand, eight hundred forty-nine".