8355961 has 2 divisors, whose sum is σ = 8355962. Its totient is φ = 8355960.

The previous prime is 8355931. The next prime is 8355967. The reversal of 8355961 is 1695538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5856400 + 2499561 = 2420^2 + 1581^2 .

It is a cyclic number.

It is not a de Polignac number, because 8355961 - 2⁵ = 8355929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8355961.

It is not a weakly prime, because it can be changed into another prime (8355967) 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, 4177980 + 4177981.

It is an arithmetic number, because the mean of its divisors is an integer number (4177981).

Almost surely, 2^8355961 is an apocalyptic number.

It is an amenable number.

8355961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8355961 is an equidigital number, since it uses as much as digits as its factorization.

8355961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 8355961 is about 2890.6679158976. The cubic root of 8355961 is about 202.9234020667.

It can be divided in two parts, 8355 and 961, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 8355961 in words is "eight million, three hundred fifty-five thousand, nine hundred sixty-one".