1008398561 has 2 divisors, whose sum is σ = 1008398562. Its totient is φ = 1008398560.

The previous prime is 1008398557. The next prime is 1008398621. The reversal of 1008398561 is 1658938001.

1008398561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588353536 + 420045025 = 24256^2 + 20495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1008398561 - 2² = 1008398557 is a prime.

It is not a weakly prime, because it can be changed into another prime (1008398551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504199280 + 504199281.

It is an arithmetic number, because the mean of its divisors is an integer number (504199281).

Almost surely, 2^1008398561 is an apocalyptic number.

It is an amenable number.

1008398561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008398561 is an equidigital number, since it uses as much as digits as its factorization.

1008398561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1008398561 is about 31755.2918582085. The cubic root of 1008398561 is about 1002.7917193836.

The spelling of 1008398561 in words is "one billion, eight million, three hundred ninety-eight thousand, five hundred sixty-one".