8661901 has 2 divisors, whose sum is σ = 8661902. Its totient is φ = 8661900.

The previous prime is 8661899. The next prime is 8661941. The reversal of 8661901 is 1091668.

It is a happy number.

8661901 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 106276 = 2925^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661901 - 2¹ = 8661899 is a prime.

Together with 8661899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8661941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330950 + 4330951.

It is an arithmetic number, because the mean of its divisors is an integer number (4330951).

Almost surely, 2^8661901 is an apocalyptic number.

It is an amenable number.

8661901 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661901 is an equidigital number, since it uses as much as digits as its factorization.

8661901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8661901 is about 2943.1107692372. The cubic root of 8661901 is about 205.3703477878.

The spelling of 8661901 in words is "eight million, six hundred sixty-one thousand, nine hundred one".