1291542541 has 2 divisors, whose sum is σ = 1291542542. Its totient is φ = 1291542540.

The previous prime is 1291542503. The next prime is 1291542557. The reversal of 1291542541 is 1452451921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 710009316 + 581533225 = 26646^2 + 24115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291542541 - 2¹⁷ = 1291411469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291542497 and 1291542506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291542041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645771270 + 645771271.

It is an arithmetic number, because the mean of its divisors is an integer number (645771271).

Almost surely, 2^1291542541 is an apocalyptic number.

It is an amenable number.

1291542541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291542541 is an equidigital number, since it uses as much as digits as its factorization.

1291542541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 1291542541 is about 35938.0375229366. The cubic root of 1291542541 is about 1089.0209599585.

The spelling of 1291542541 in words is "one billion, two hundred ninety-one million, five hundred forty-two thousand, five hundred forty-one".