8641957 has 2 divisors, whose sum is σ = 8641958. Its totient is φ = 8641956.

The previous prime is 8641949. The next prime is 8641987. The reversal of 8641957 is 7591468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6180196 + 2461761 = 2486^2 + 1569^2 .

It is a cyclic number.

It is not a de Polignac number, because 8641957 - 2³ = 8641949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8641987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320978 + 4320979.

It is an arithmetic number, because the mean of its divisors is an integer number (4320979).

Almost surely, 2^8641957 is an apocalyptic number.

It is an amenable number.

8641957 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641957 is an equidigital number, since it uses as much as digits as its factorization.

8641957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 8641957 is about 2939.7205649517. The cubic root of 8641957 is about 205.2126051304.

The spelling of 8641957 in words is "eight million, six hundred forty-one thousand, nine hundred fifty-seven".