877921897 has 2 divisors, whose sum is σ = 877921898. Its totient is φ = 877921896.

The previous prime is 877921873. The next prime is 877921907. The reversal of 877921897 is 798129778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649791081 + 228130816 = 25491^2 + 15104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-877921897 is a prime.

It is not a weakly prime, because it can be changed into another prime (877921817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438960948 + 438960949.

It is an arithmetic number, because the mean of its divisors is an integer number (438960949).

Almost surely, 2^877921897 is an apocalyptic number.

It is an amenable number.

877921897 is a deficient number, since it is larger than the sum of its proper divisors (1).

877921897 is an equidigital number, since it uses as much as digits as its factorization.

877921897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 58.

The square root of 877921897 is about 29629.7468264580. The cubic root of 877921897 is about 957.5290538305.

The spelling of 877921897 in words is "eight hundred seventy-seven million, nine hundred twenty-one thousand, eight hundred ninety-seven".