1291478481 has 12 divisors (see below), whose sum is σ = 1866217860. Its totient is φ = 860640000.

The previous prime is 1291478479. The next prime is 1291478483. The reversal of 1291478481 is 1848741921.

1291478481 is a `hidden beast` number, since 1 + 29 + 147 + 8 + 481 = 666.

It is an interprime number because it is at equal distance from previous prime (1291478479) and next prime (1291478483).

It can be written as a sum of positive squares in 2 ways, for example, as 240746256 + 1050732225 = 15516^2 + 32415^2 .

It is not a de Polignac number, because 1291478481 - 2¹ = 1291478479 is a prime.

It is a super-2 number, since 2×1291478481² = 3335833333772134722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1291478483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4020 + ... + 50981.

It is an arithmetic number, because the mean of its divisors is an integer number (155518155).

Almost surely, 2^1291478481 is an apocalyptic number.

It is an amenable number.

1291478481 is a deficient number, since it is larger than the sum of its proper divisors (574739379).

1291478481 is a wasteful number, since it uses less digits than its factorization.

1291478481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57616 (or 57613 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1291478481 is about 35937.1462556503. The cubic root of 1291478481 is about 1089.0029546576.

The spelling of 1291478481 in words is "one billion, two hundred ninety-one million, four hundred seventy-eight thousand, four hundred eighty-one".