191226649 has 4 divisors (see below), whose sum is σ = 191504080. Its totient is φ = 190949220.

The previous prime is 191226647. The next prime is 191226671. The reversal of 191226649 is 946622191.

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: 946622191 = 9391 ⋅100801.

It is a cyclic number.

It is not a de Polignac number, because 191226649 - 2¹ = 191226647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191226641) 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, 137679 + ... + 139060.

It is an arithmetic number, because the mean of its divisors is an integer number (47876020).

Almost surely, 2^191226649 is an apocalyptic number.

It is an amenable number.

191226649 is a deficient number, since it is larger than the sum of its proper divisors (277431).

191226649 is an equidigital number, since it uses as much as digits as its factorization.

191226649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277430.

The product of its digits is 46656, while the sum is 40.

The square root of 191226649 is about 13828.4724029807. The cubic root of 191226649 is about 576.1242267183.

It can be divided in two parts, 1912 and 26649, that added together give a 4-th power (28561 = 13⁴).

The spelling of 191226649 in words is "one hundred ninety-one million, two hundred twenty-six thousand, six hundred forty-nine".