1313240989 has 2 divisors, whose sum is σ = 1313240990. Its totient is φ = 1313240988.

The previous prime is 1313240983. The next prime is 1313241043. The reversal of 1313240989 is 9890423131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 735223225 + 578017764 = 27115^2 + 24042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313240989 - 2⁷ = 1313240861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313240983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656620494 + 656620495.

It is an arithmetic number, because the mean of its divisors is an integer number (656620495).

Almost surely, 2^1313240989 is an apocalyptic number.

It is an amenable number.

1313240989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313240989 is an equidigital number, since it uses as much as digits as its factorization.

1313240989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1313240989 is about 36238.6670422630. The cubic root of 1313240989 is about 1095.0857890988.

The spelling of 1313240989 in words is "one billion, three hundred thirteen million, two hundred forty thousand, nine hundred eighty-nine".