8490661 has 2 divisors, whose sum is σ = 8490662. Its totient is φ = 8490660.

The previous prime is 8490637. The next prime is 8490673. The reversal of 8490661 is 1660948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8014561 + 476100 = 2831^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 8490661 - 2¹⁵ = 8457893 is a prime.

8490661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8490761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245330 + 4245331.

It is an arithmetic number, because the mean of its divisors is an integer number (4245331).

Almost surely, 2^8490661 is an apocalyptic number.

It is an amenable number.

8490661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8490661 is an equidigital number, since it uses as much as digits as its factorization.

8490661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 8490661 is about 2913.8738819654. The cubic root of 8490661 is about 204.0079853980.

The spelling of 8490661 in words is "eight million, four hundred ninety thousand, six hundred sixty-one".