813771023 has 4 divisors (see below), whose sum is σ = 876368808. Its totient is φ = 751173240.

The previous prime is 813770983. The next prime is 813771029. The reversal of 813771023 is 320177318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320177318 = 2 ⋅160088659.

It is a cyclic number.

It is not a de Polignac number, because 813771023 - 2⁸ = 813770767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813771029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31298873 + ... + 31298898.

It is an arithmetic number, because the mean of its divisors is an integer number (219092202).

Almost surely, 2^813771023 is an apocalyptic number.

813771023 is a deficient number, since it is larger than the sum of its proper divisors (62597785).

813771023 is a wasteful number, since it uses less digits than its factorization.

813771023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62597784.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 813771023 is about 28526.6721332861. The cubic root of 813771023 is about 933.6141108333.

The spelling of 813771023 in words is "eight hundred thirteen million, seven hundred seventy-one thousand, twenty-three".