813770071 has 4 divisors (see below), whose sum is σ = 816037200. Its totient is φ = 811502944.

The previous prime is 813770053. The next prime is 813770117. The reversal of 813770071 is 170077318.

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

It is a cyclic number.

It is not a de Polignac number, because 813770071 - 2¹¹ = 813768023 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 (813770011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133026 + ... + 1133743.

It is an arithmetic number, because the mean of its divisors is an integer number (204009300).

Almost surely, 2^813770071 is an apocalyptic number.

813770071 is a deficient number, since it is larger than the sum of its proper divisors (2267129).

813770071 is a wasteful number, since it uses less digits than its factorization.

813770071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267128.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 813770071 is about 28526.6554471428. The cubic root of 813770071 is about 933.6137467666.

It can be divided in two parts, 813 and 770071, that added together give a square (770884 = 878²).

The spelling of 813770071 in words is "eight hundred thirteen million, seven hundred seventy thousand, seventy-one".