1291481 has 2 divisors, whose sum is σ = 1291482. Its totient is φ = 1291480.

The previous prime is 1291471. The next prime is 1291483. The reversal of 1291481 is 1841921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 379456 = 955^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291481 - 2¹⁸ = 1029337 is a prime.

It is a super-2 number, since 2×1291481² = 3335846346722, which contains 22 as substring.

Together with 1291483, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291481.

It is not a weakly prime, because it can be changed into another prime (1291483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645740 + 645741.

It is an arithmetic number, because the mean of its divisors is an integer number (645741).

2^1291481 is an apocalyptic number.

It is an amenable number.

1291481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291481 is an equidigital number, since it uses as much as digits as its factorization.

1291481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 26.

The square root of 1291481 is about 1136.4334560369. The cubic root of 1291481 is about 108.9003662682.

The spelling of 1291481 in words is "one million, two hundred ninety-one thousand, four hundred eighty-one".