1285267091 has 2 divisors, whose sum is σ = 1285267092. Its totient is φ = 1285267090.

The previous prime is 1285267079. The next prime is 1285267129. The reversal of 1285267091 is 1907625821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285267091 - 2¹⁰ = 1285266067 is a prime.

It is a super-2 number, since 2×1285267091² = 3303822990415204562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1285267001) 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 as a sum of consecutive naturals, namely, 642633545 + 642633546.

It is an arithmetic number, because the mean of its divisors is an integer number (642633546).

Almost surely, 2^1285267091 is an apocalyptic number.

1285267091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285267091 is an equidigital number, since it uses as much as digits as its factorization.

1285267091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1285267091 is about 35850.6219053450. The cubic root of 1285267091 is about 1087.2542881878.

The spelling of 1285267091 in words is "one billion, two hundred eighty-five million, two hundred sixty-seven thousand, ninety-one".