1291252541 has 2 divisors, whose sum is σ = 1291252542. Its totient is φ = 1291252540.

The previous prime is 1291252511. The next prime is 1291252601. The reversal of 1291252541 is 1452521921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1252452100 + 38800441 = 35390^2 + 6229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291252541 - 2¹⁴ = 1291236157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291252498 and 1291252507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291252511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645626270 + 645626271.

It is an arithmetic number, because the mean of its divisors is an integer number (645626271).

Almost surely, 2^1291252541 is an apocalyptic number.

It is an amenable number.

1291252541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291252541 is an equidigital number, since it uses as much as digits as its factorization.

1291252541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 32.

The square root of 1291252541 is about 35934.0025741637. The cubic root of 1291252541 is about 1088.9394451009.

The spelling of 1291252541 in words is "one billion, two hundred ninety-one million, two hundred fifty-two thousand, five hundred forty-one".