1291396097 has 2 divisors, whose sum is σ = 1291396098. Its totient is φ = 1291396096.

The previous prime is 1291396069. The next prime is 1291396103. The reversal of 1291396097 is 7906931921.

It is a Cunningham number, because it is equal to 35936²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1291396096 + 1 = 35936^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291396097 - 2¹² = 1291392001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291396027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645698048 + 645698049.

It is an arithmetic number, because the mean of its divisors is an integer number (645698049).

Almost surely, 2^1291396097 is an apocalyptic number.

It is an amenable number.

1291396097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291396097 is an equidigital number, since it uses as much as digits as its factorization.

1291396097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 1291396097 is about 35936.0000139136. Note that the first 4 decimals coincide. The cubic root of 1291396097 is about 1088.9797981672.

The spelling of 1291396097 in words is "one billion, two hundred ninety-one million, three hundred ninety-six thousand, ninety-seven".