816994371 has 4 divisors (see below), whose sum is σ = 1089325832. Its totient is φ = 544662912.

The previous prime is 816994337. The next prime is 816994393. The reversal of 816994371 is 173499618.

It is a happy number.

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

It is not a de Polignac number, because 816994371 - 2¹³ = 816986179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816994371.

It is not an unprimeable number, because it can be changed into a prime (816994271) 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, 136165726 + ... + 136165731.

It is an arithmetic number, because the mean of its divisors is an integer number (272331458).

Almost surely, 2^816994371 is an apocalyptic number.

816994371 is a deficient number, since it is larger than the sum of its proper divisors (272331461).

816994371 is a wasteful number, since it uses less digits than its factorization.

816994371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272331460.

The product of its digits is 326592, while the sum is 48.

The square root of 816994371 is about 28583.1133888525. The cubic root of 816994371 is about 934.8451690585.

The spelling of 816994371 in words is "eight hundred sixteen million, nine hundred ninety-four thousand, three hundred seventy-one".