8421901 has 2 divisors, whose sum is σ = 8421902. Its totient is φ = 8421900.

The previous prime is 8421877. The next prime is 8421911. The reversal of 8421901 is 1091248.

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., 7557001 + 864900 = 2749^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421901 - 2⁷ = 8421773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210950 + 4210951.

It is an arithmetic number, because the mean of its divisors is an integer number (4210951).

Almost surely, 2^8421901 is an apocalyptic number.

8421901 is the 1676-th hex number.

It is an amenable number.

8421901 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421901 is an equidigital number, since it uses as much as digits as its factorization.

8421901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 8421901 is about 2902.0511711546. The cubic root of 8421901 is about 203.4557854790.

The spelling of 8421901 in words is "eight million, four hundred twenty-one thousand, nine hundred one".