1291542041 has 2 divisors, whose sum is σ = 1291542042. Its totient is φ = 1291542040.

The previous prime is 1291541963. The next prime is 1291542059. The reversal of 1291542041 is 1402451921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816302041 + 475240000 = 28571^2 + 21800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291542041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291541995 and 1291542013.

It is not a weakly prime, because it can be changed into another prime (1291542541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645771020 + 645771021.

It is an arithmetic number, because the mean of its divisors is an integer number (645771021).

Almost surely, 2^1291542041 is an apocalyptic number.

It is an amenable number.

1291542041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291542041 is an equidigital number, since it uses as much as digits as its factorization.

1291542041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1291542041 is about 35938.0305665182. The cubic root of 1291542041 is about 1089.0208194261.

Adding to 1291542041 its reverse (1402451921), we get a palindrome (2693993962).

The spelling of 1291542041 in words is "one billion, two hundred ninety-one million, five hundred forty-two thousand, forty-one".