1391086481 has 2 divisors, whose sum is σ = 1391086482. Its totient is φ = 1391086480.

The previous prime is 1391086469. The next prime is 1391086519. The reversal of 1391086481 is 1846801931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1110222400 + 280864081 = 33320^2 + 16759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391086481 - 2¹⁰ = 1391085457 is a prime.

It is a super-2 number, since 2×1391086481² = 3870243195241926722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1391086381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695543240 + 695543241.

It is an arithmetic number, because the mean of its divisors is an integer number (695543241).

Almost surely, 2^1391086481 is an apocalyptic number.

It is an amenable number.

1391086481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391086481 is an equidigital number, since it uses as much as digits as its factorization.

1391086481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 1391086481 is about 37297.2717634950. The cubic root of 1391086481 is about 1116.3097296060.

The spelling of 1391086481 in words is "one billion, three hundred ninety-one million, eighty-six thousand, four hundred eighty-one".