1911227245 has 4 divisors (see below), whose sum is σ = 2293472700. Its totient is φ = 1528981792.

The previous prime is 1911227231. The next prime is 1911227249. The reversal of 1911227245 is 5427221191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5427221191 = 7 ⋅775317313.

It can be written as a sum of positive squares in 2 ways, for example, as 232440516 + 1678786729 = 15246^2 + 40973^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911227245 - 2¹⁹ = 1910702957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1911227245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911227249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191122720 + ... + 191122729.

It is an arithmetic number, because the mean of its divisors is an integer number (573368175).

Almost surely, 2^1911227245 is an apocalyptic number.

It is an amenable number.

1911227245 is a deficient number, since it is larger than the sum of its proper divisors (382245455).

1911227245 is an equidigital number, since it uses as much as digits as its factorization.

1911227245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382245454.

The product of its digits is 10080, while the sum is 34.

The square root of 1911227245 is about 43717.5850774033. The cubic root of 1911227245 is about 1240.9971265514.

The spelling of 1911227245 in words is "one billion, nine hundred eleven million, two hundred twenty-seven thousand, two hundred forty-five".