1291402067 has 2 divisors, whose sum is σ = 1291402068. Its totient is φ = 1291402066.

The previous prime is 1291402043. The next prime is 1291402069. The reversal of 1291402067 is 7602041921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291402067 - 2⁶ = 1291402003 is a prime.

Together with 1291402069, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1291402069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645701033 + 645701034.

It is an arithmetic number, because the mean of its divisors is an integer number (645701034).

Almost surely, 2^1291402067 is an apocalyptic number.

1291402067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291402067 is an equidigital number, since it uses as much as digits as its factorization.

1291402067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1291402067 is about 35936.0830781542. The cubic root of 1291402067 is about 1088.9814762476.

Adding to 1291402067 its reverse (7602041921), we get a palindrome (8893443988).

The spelling of 1291402067 in words is "one billion, two hundred ninety-one million, four hundred two thousand, sixty-seven".