816946877 has 4 divisors (see below), whose sum is σ = 817688640. Its totient is φ = 816205116.

The previous prime is 816946847. The next prime is 816946891. The reversal of 816946877 is 778649618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 778649618 = 2 ⋅389324809.

It is a cyclic number.

It is not a de Polignac number, because 816946877 - 2²² = 812752573 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 (816946817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369227 + ... + 371432.

It is an arithmetic number, because the mean of its divisors is an integer number (204422160).

Almost surely, 2^816946877 is an apocalyptic number.

It is an amenable number.

816946877 is a deficient number, since it is larger than the sum of its proper divisors (741763).

816946877 is a wasteful number, since it uses less digits than its factorization.

816946877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741762.

The product of its digits is 4064256, while the sum is 56.

The square root of 816946877 is about 28582.2825715512. The cubic root of 816946877 is about 934.8270537167.

The spelling of 816946877 in words is "eight hundred sixteen million, nine hundred forty-six thousand, eight hundred seventy-seven".