1291745401 has 2 divisors, whose sum is σ = 1291745402. Its totient is φ = 1291745400.

The previous prime is 1291745393. The next prime is 1291745449. The reversal of 1291745401 is 1045471921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092963600 + 198781801 = 33060^2 + 14099^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291745401 - 2³ = 1291745393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291745491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645872700 + 645872701.

It is an arithmetic number, because the mean of its divisors is an integer number (645872701).

Almost surely, 2^1291745401 is an apocalyptic number.

It is an amenable number.

1291745401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291745401 is an equidigital number, since it uses as much as digits as its factorization.

1291745401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1291745401 is about 35940.8597699053. The cubic root of 1291745401 is about 1089.0779737539.

Adding to 1291745401 its product of nonzero digits (10080), we get a square (1291755481 = 35941²).

The spelling of 1291745401 in words is "one billion, two hundred ninety-one million, seven hundred forty-five thousand, four hundred one".