1291485743 has 2 divisors, whose sum is σ = 1291485744. Its totient is φ = 1291485742.

The previous prime is 1291485731. The next prime is 1291485749. The reversal of 1291485743 is 3475841921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291485743 - 2⁸ = 1291485487 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291485694 and 1291485703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291485749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645742871 + 645742872.

It is an arithmetic number, because the mean of its divisors is an integer number (645742872).

Almost surely, 2^1291485743 is an apocalyptic number.

1291485743 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291485743 is an equidigital number, since it uses as much as digits as its factorization.

1291485743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 1291485743 is about 35937.2472930245. The cubic root of 1291485743 is about 1089.0049958129.

The spelling of 1291485743 in words is "one billion, two hundred ninety-one million, four hundred eighty-five thousand, seven hundred forty-three".