811540745 has 4 divisors (see below), whose sum is σ = 973848900. Its totient is φ = 649232592.

The previous prime is 811540739. The next prime is 811540753. The reversal of 811540745 is 547045118.

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

It can be written as a sum of positive squares in 2 ways, for example, as 264355081 + 547185664 = 16259^2 + 23392^2 .

It is a cyclic number.

It is not a de Polignac number, because 811540745 - 2⁴ = 811540729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81154070 + ... + 81154079.

It is an arithmetic number, because the mean of its divisors is an integer number (243462225).

Almost surely, 2^811540745 is an apocalyptic number.

It is an amenable number.

811540745 is a deficient number, since it is larger than the sum of its proper divisors (162308155).

811540745 is a wasteful number, since it uses less digits than its factorization.

811540745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162308154.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 811540745 is about 28487.5542123223. The cubic root of 811540745 is about 932.7604210034.

The spelling of 811540745 in words is "eight hundred eleven million, five hundred forty thousand, seven hundred forty-five".