1290787489 has 2 divisors, whose sum is σ = 1290787490. Its totient is φ = 1290787488.

The previous prime is 1290787481. The next prime is 1290787501. The reversal of 1290787489 is 9847870921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657409600 + 633377889 = 25640^2 + 25167^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290787489 - 2³ = 1290787481 is a prime.

It is a super-2 number, since 2×1290787489² = 3332264683517850242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1290787481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645393744 + 645393745.

It is an arithmetic number, because the mean of its divisors is an integer number (645393745).

Almost surely, 2^1290787489 is an apocalyptic number.

It is an amenable number.

1290787489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290787489 is an equidigital number, since it uses as much as digits as its factorization.

1290787489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The square root of 1290787489 is about 35927.5310729808. The cubic root of 1290787489 is about 1088.8087001436.

The spelling of 1290787489 in words is "one billion, two hundred ninety million, seven hundred eighty-seven thousand, four hundred eighty-nine".