1249581089 has 2 divisors, whose sum is σ = 1249581090. Its totient is φ = 1249581088.

The previous prime is 1249581083. The next prime is 1249581121. The reversal of 1249581089 is 9801859421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866713600 + 382867489 = 29440^2 + 19567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249581089 is a prime.

It is a super-2 number, since 2×1249581089² = 3122905795972851842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1249581083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624790544 + 624790545.

It is an arithmetic number, because the mean of its divisors is an integer number (624790545).

Almost surely, 2^1249581089 is an apocalyptic number.

It is an amenable number.

1249581089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249581089 is an equidigital number, since it uses as much as digits as its factorization.

1249581089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 47.

The square root of 1249581089 is about 35349.4142667173. The cubic root of 1249581089 is about 1077.0969960521.

The spelling of 1249581089 in words is "one billion, two hundred forty-nine million, five hundred eighty-one thousand, eighty-nine".