1287740149 has 2 divisors, whose sum is σ = 1287740150. Its totient is φ = 1287740148.

The previous prime is 1287740147. The next prime is 1287740159. The reversal of 1287740149 is 9410477821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211527249 + 76212900 = 34807^2 + 8730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287740149 - 2¹ = 1287740147 is a prime.

Together with 1287740147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287740147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643870074 + 643870075.

It is an arithmetic number, because the mean of its divisors is an integer number (643870075).

Almost surely, 2^1287740149 is an apocalyptic number.

It is an amenable number.

1287740149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287740149 is an equidigital number, since it uses as much as digits as its factorization.

1287740149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 1287740149 is about 35885.0964747205. The cubic root of 1287740149 is about 1087.9511913681.

The spelling of 1287740149 in words is "one billion, two hundred eighty-seven million, seven hundred forty thousand, one hundred forty-nine".