1290948257 has 2 divisors, whose sum is σ = 1290948258. Its totient is φ = 1290948256.

The previous prime is 1290948247. The next prime is 1290948271. The reversal of 1290948257 is 7528490921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199860321 + 91087936 = 34639^2 + 9544^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290948257 - 2²⁸ = 1022512801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290948247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645474128 + 645474129.

It is an arithmetic number, because the mean of its divisors is an integer number (645474129).

Almost surely, 2^1290948257 is an apocalyptic number.

It is an amenable number.

1290948257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290948257 is an equidigital number, since it uses as much as digits as its factorization.

1290948257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1290948257 is about 35929.7683961364. The cubic root of 1290948257 is about 1088.8539020925.

The spelling of 1290948257 in words is "one billion, two hundred ninety million, nine hundred forty-eight thousand, two hundred fifty-seven".