1290981249 has 6 divisors (see below), whose sum is σ = 1864750706. Its totient is φ = 860654160.

The previous prime is 1290981221. The next prime is 1290981271. The reversal of 1290981249 is 9421890921.

It can be written as a sum of positive squares in only one way, i.e., 1283932224 + 7049025 = 35832^2 + 2655^2 .

It is not a de Polignac number, because 1290981249 - 2⁷ = 1290981121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290981449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71721172 + ... + 71721189.

Almost surely, 2^1290981249 is an apocalyptic number.

It is an amenable number.

1290981249 is a deficient number, since it is larger than the sum of its proper divisors (573769457).

1290981249 is a wasteful number, since it uses less digits than its factorization.

1290981249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143442367 (or 143442364 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1290981249 is about 35930.2275111082. The cubic root of 1290981249 is about 1088.8631777449.

The spelling of 1290981249 in words is "one billion, two hundred ninety million, nine hundred eighty-one thousand, two hundred forty-nine".