1291232653 has 2 divisors, whose sum is σ = 1291232654. Its totient is φ = 1291232652.

The previous prime is 1291232599. The next prime is 1291232707. The reversal of 1291232653 is 3562321921.

It is a balanced prime because it is at equal distance from previous prime (1291232599) and next prime (1291232707).

It can be written as a sum of positive squares in only one way, i.e., 1060283844 + 230948809 = 32562^2 + 15197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291232653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291232753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645616326 + 645616327.

It is an arithmetic number, because the mean of its divisors is an integer number (645616327).

Almost surely, 2^1291232653 is an apocalyptic number.

It is an amenable number.

1291232653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291232653 is an equidigital number, since it uses as much as digits as its factorization.

1291232653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 1291232653 is about 35933.7258435582. The cubic root of 1291232653 is about 1088.9338544210.

The spelling of 1291232653 in words is "one billion, two hundred ninety-one million, two hundred thirty-two thousand, six hundred fifty-three".