8861921 has 2 divisors, whose sum is σ = 8861922. Its totient is φ = 8861920.

The previous prime is 8861911. The next prime is 8861927. The reversal of 8861921 is 1291688.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8042896 + 819025 = 2836^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 8861921 - 2⁶ = 8861857 is a prime.

It is not a weakly prime, because it can be changed into another prime (8861927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4430960 + 4430961.

It is an arithmetic number, because the mean of its divisors is an integer number (4430961).

Almost surely, 2^8861921 is an apocalyptic number.

It is an amenable number.

8861921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8861921 is an equidigital number, since it uses as much as digits as its factorization.

8861921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 8861921 is about 2976.8978820242. The cubic root of 8861921 is about 206.9391327649.

The spelling of 8861921 in words is "eight million, eight hundred sixty-one thousand, nine hundred twenty-one".