1291067653 has 2 divisors, whose sum is σ = 1291067654. Its totient is φ = 1291067652.

The previous prime is 1291067627. The next prime is 1291067693. The reversal of 1291067653 is 3567601921.

It is an a-pointer prime, because the next prime (1291067693) can be obtained adding 1291067653 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1225490049 + 65577604 = 35007^2 + 8098^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291067653 - 2¹³ = 1291059461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291067693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645533826 + 645533827.

It is an arithmetic number, because the mean of its divisors is an integer number (645533827).

Almost surely, 2^1291067653 is an apocalyptic number.

It is an amenable number.

1291067653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291067653 is an equidigital number, since it uses as much as digits as its factorization.

1291067653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1291067653 is about 35931.4298769197. The cubic root of 1291067653 is about 1088.8874693539.

The spelling of 1291067653 in words is "one billion, two hundred ninety-one million, sixty-seven thousand, six hundred fifty-three".