8312921 has 2 divisors, whose sum is σ = 8312922. Its totient is φ = 8312920.

The previous prime is 8312911. The next prime is 8312947. The reversal of 8312921 is 1292138.

It is an a-pointer prime, because the next prime (8312947) can be obtained adding 8312921 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 1784896 = 2555^2 + 1336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8312921 is a prime.

It is a Chen prime.

It is equal to p₅₅₉₄₂₁ and since 8312921 and 559421 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8312911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4156460 + 4156461.

It is an arithmetic number, because the mean of its divisors is an integer number (4156461).

Almost surely, 2^8312921 is an apocalyptic number.

It is an amenable number.

8312921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8312921 is an equidigital number, since it uses as much as digits as its factorization.

8312921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 8312921 is about 2883.2136584027. The cubic root of 8312921 is about 202.5743952632.

The spelling of 8312921 in words is "eight million, three hundred twelve thousand, nine hundred twenty-one".