811742618 has 4 divisors (see below), whose sum is σ = 1217613930. Its totient is φ = 405871308.

The previous prime is 811742597. The next prime is 811742621. The reversal of 811742618 is 816247118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 533286649 + 278455969 = 23093^2 + 16687^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202935653 + ... + 202935656.

Almost surely, 2^811742618 is an apocalyptic number.

811742618 is a deficient number, since it is larger than the sum of its proper divisors (405871312).

811742618 is a wasteful number, since it uses less digits than its factorization.

811742618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405871311.

The product of its digits is 21504, while the sum is 38.

The square root of 811742618 is about 28491.0971708708. The cubic root of 811742618 is about 932.8377568342.

The spelling of 811742618 in words is "eight hundred eleven million, seven hundred forty-two thousand, six hundred eighteen".