1291137451 has 2 divisors, whose sum is σ = 1291137452. Its totient is φ = 1291137450.

The previous prime is 1291137431. The next prime is 1291137461. The reversal of 1291137451 is 1547311921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291137451 - 2⁹ = 1291136939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291137431) 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, 645568725 + 645568726.

It is an arithmetic number, because the mean of its divisors is an integer number (645568726).

Almost surely, 2^1291137451 is an apocalyptic number.

1291137451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291137451 is an equidigital number, since it uses as much as digits as its factorization.

1291137451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 1291137451 is about 35932.4011304561. The cubic root of 1291137451 is about 1088.9070915629.

The spelling of 1291137451 in words is "one billion, two hundred ninety-one million, one hundred thirty-seven thousand, four hundred fifty-one".