8629561 has 2 divisors, whose sum is σ = 8629562. Its totient is φ = 8629560.

The previous prime is 8629507. The next prime is 8629583. The reversal of 8629561 is 1659268.

8629561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5546025 + 3083536 = 2355^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 8629561 - 2⁷ = 8629433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8629561.

It is not a weakly prime, because it can be changed into another prime (8629661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4314780 + 4314781.

It is an arithmetic number, because the mean of its divisors is an integer number (4314781).

Almost surely, 2^8629561 is an apocalyptic number.

It is an amenable number.

8629561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8629561 is an equidigital number, since it uses as much as digits as its factorization.

8629561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 8629561 is about 2937.6114446945. The cubic root of 8629561 is about 205.1144393752.

The spelling of 8629561 in words is "eight million, six hundred twenty-nine thousand, five hundred sixty-one".