1290342091 has 2 divisors, whose sum is σ = 1290342092. Its totient is φ = 1290342090.

The previous prime is 1290342083. The next prime is 1290342103. The reversal of 1290342091 is 1902430921.

It is a weak prime.

It is an emirp because it is prime and its reverse (1902430921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1290342091 - 2³ = 1290342083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1290342061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645171045 + 645171046.

It is an arithmetic number, because the mean of its divisors is an integer number (645171046).

Almost surely, 2^1290342091 is an apocalyptic number.

1290342091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290342091 is an equidigital number, since it uses as much as digits as its factorization.

1290342091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1290342091 is about 35921.3319769744. The cubic root of 1290342091 is about 1088.6834512777.

The spelling of 1290342091 in words is "one billion, two hundred ninety million, three hundred forty-two thousand, ninety-one".