811223649 has 12 divisors (see below), whose sum is σ = 1172800512. Its totient is φ = 540339000.

The previous prime is 811223591. The next prime is 811223683. The reversal of 811223649 is 946322118.

811223649 is a `hidden beast` number, since 8 + 1 + 1 + 2 + 2 + 3 + 649 = 666.

It is not a de Polignac number, because 811223649 - 2¹⁹ = 810699361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (811223249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28797 + ... + 49514.

It is an arithmetic number, because the mean of its divisors is an integer number (97733376).

Almost surely, 2^811223649 is an apocalyptic number.

It is an amenable number.

811223649 is a deficient number, since it is larger than the sum of its proper divisors (361576863).

811223649 is a wasteful number, since it uses less digits than its factorization.

811223649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79468 (or 79465 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 811223649 is about 28481.9881504083. The cubic root of 811223649 is about 932.6389183220.

The spelling of 811223649 in words is "eight hundred eleven million, two hundred twenty-three thousand, six hundred forty-nine".