8121901 has 2 divisors, whose sum is σ = 8121902. Its totient is φ = 8121900.

The previous prime is 8121889. The next prime is 8121923. The reversal of 8121901 is 1091218.

It is an a-pointer prime, because the next prime (8121923) can be obtained adding 8121901 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6245001 + 1876900 = 2499^2 + 1370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060950 + 4060951.

It is an arithmetic number, because the mean of its divisors is an integer number (4060951).

Almost surely, 2^8121901 is an apocalyptic number.

It is an amenable number.

8121901 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121901 is an equidigital number, since it uses as much as digits as its factorization.

8121901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 8121901 is about 2849.8949103432. The cubic root of 8121901 is about 201.0107252348.

The spelling of 8121901 in words is "eight million, one hundred twenty-one thousand, nine hundred one".