1286135491 has 2 divisors, whose sum is σ = 1286135492. Its totient is φ = 1286135490.

The previous prime is 1286135423. The next prime is 1286135507. The reversal of 1286135491 is 1945316821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286135491 is a prime.

It is a super-2 number, since 2×1286135491² = 3308289002419622162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1286235491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643067745 + 643067746.

It is an arithmetic number, because the mean of its divisors is an integer number (643067746).

Almost surely, 2^1286135491 is an apocalyptic number.

1286135491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286135491 is an equidigital number, since it uses as much as digits as its factorization.

1286135491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 1286135491 is about 35862.7312261629. The cubic root of 1286135491 is about 1087.4991034652.

The spelling of 1286135491 in words is "one billion, two hundred eighty-six million, one hundred thirty-five thousand, four hundred ninety-one".