1291749451 has 2 divisors, whose sum is σ = 1291749452. Its totient is φ = 1291749450.

The previous prime is 1291749427. The next prime is 1291749479. The reversal of 1291749451 is 1549471921.

It is a weak prime.

It is an emirp because it is prime and its reverse (1549471921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291749451 - 2¹⁹ = 1291225163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291749398 and 1291749407.

It is not a weakly prime, because it can be changed into another prime (1291749401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645874725 + 645874726.

It is an arithmetic number, because the mean of its divisors is an integer number (645874726).

Almost surely, 2^1291749451 is an apocalyptic number.

1291749451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291749451 is an equidigital number, since it uses as much as digits as its factorization.

1291749451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 1291749451 is about 35940.9161124198. The cubic root of 1291749451 is about 1089.0791119454.

The spelling of 1291749451 in words is "one billion, two hundred ninety-one million, seven hundred forty-nine thousand, four hundred fifty-one".