1008823661 has 2 divisors, whose sum is σ = 1008823662. Its totient is φ = 1008823660.

The previous prime is 1008823649. The next prime is 1008823687. The reversal of 1008823661 is 1663288001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1005270436 + 3553225 = 31706^2 + 1885^2 .

It is an emirp because it is prime and its reverse (1663288001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1008823661 - 2⁶ = 1008823597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1008823691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504411830 + 504411831.

It is an arithmetic number, because the mean of its divisors is an integer number (504411831).

Almost surely, 2^1008823661 is an apocalyptic number.

It is an amenable number.

1008823661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008823661 is an equidigital number, since it uses as much as digits as its factorization.

1008823661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1008823661 is about 31761.9845255299. The cubic root of 1008823661 is about 1002.9326117148.

The spelling of 1008823661 in words is "one billion, eight million, eight hundred twenty-three thousand, six hundred sixty-one".