824490661 has 2 divisors, whose sum is σ = 824490662. Its totient is φ = 824490660.

The previous prime is 824490613. The next prime is 824490679. The reversal of 824490661 is 166094428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 804856900 + 19633761 = 28370^2 + 4431^2 .

It is a cyclic number.

It is not a de Polignac number, because 824490661 - 2¹⁷ = 824359589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (824490691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412245330 + 412245331.

It is an arithmetic number, because the mean of its divisors is an integer number (412245331).

Almost surely, 2^824490661 is an apocalyptic number.

It is an amenable number.

824490661 is a deficient number, since it is larger than the sum of its proper divisors (1).

824490661 is an equidigital number, since it uses as much as digits as its factorization.

824490661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 824490661 is about 28713.9454098527. The cubic root of 824490661 is about 937.6956765123.

The spelling of 824490661 in words is "eight hundred twenty-four million, four hundred ninety thousand, six hundred sixty-one".