1290247949 has 2 divisors, whose sum is σ = 1290247950. Its totient is φ = 1290247948.

The previous prime is 1290247921. The next prime is 1290247967. The reversal of 1290247949 is 9497420921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 933302500 + 356945449 = 30550^2 + 18893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290247949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290247349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645123974 + 645123975.

It is an arithmetic number, because the mean of its divisors is an integer number (645123975).

Almost surely, 2^1290247949 is an apocalyptic number.

It is an amenable number.

1290247949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290247949 is an equidigital number, since it uses as much as digits as its factorization.

1290247949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1290247949 is about 35920.0215617975. The cubic root of 1290247949 is about 1088.6569742345.

The spelling of 1290247949 in words is "one billion, two hundred ninety million, two hundred forty-seven thousand, nine hundred forty-nine".