1290342457 has 2 divisors, whose sum is σ = 1290342458. Its totient is φ = 1290342456.

The previous prime is 1290342401. The next prime is 1290342461. The reversal of 1290342457 is 7542430921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288163881 + 2178576 = 35891^2 + 1476^2 .

It is an emirp because it is prime and its reverse (7542430921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290342457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290142457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645171228 + 645171229.

It is an arithmetic number, because the mean of its divisors is an integer number (645171229).

Almost surely, 2^1290342457 is an apocalyptic number.

It is an amenable number.

1290342457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290342457 is an equidigital number, since it uses as much as digits as its factorization.

1290342457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1290342457 is about 35921.3370714399. The cubic root of 1290342457 is about 1088.6835542112.

The spelling of 1290342457 in words is "one billion, two hundred ninety million, three hundred forty-two thousand, four hundred fifty-seven".