863126921 has 2 divisors, whose sum is σ = 863126922. Its totient is φ = 863126920.

The previous prime is 863126863. The next prime is 863126947. The reversal of 863126921 is 129621368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569347321 + 293779600 = 23861^2 + 17140^2 .

It is a cyclic number.

It is not a de Polignac number, because 863126921 - 2¹⁰ = 863125897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (863126021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431563460 + 431563461.

It is an arithmetic number, because the mean of its divisors is an integer number (431563461).

Almost surely, 2^863126921 is an apocalyptic number.

It is an amenable number.

863126921 is a deficient number, since it is larger than the sum of its proper divisors (1).

863126921 is an equidigital number, since it uses as much as digits as its factorization.

863126921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 863126921 is about 29379.0217842596. The cubic root of 863126921 is about 952.1197067329.

The spelling of 863126921 in words is "eight hundred sixty-three million, one hundred twenty-six thousand, nine hundred twenty-one".