1285001791 has 2 divisors, whose sum is σ = 1285001792. Its totient is φ = 1285001790.

The previous prime is 1285001759. The next prime is 1285001821. The reversal of 1285001791 is 1971005821.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1971005821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285001791 - 2⁵ = 1285001759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285001701) 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, 642500895 + 642500896.

It is an arithmetic number, because the mean of its divisors is an integer number (642500896).

Almost surely, 2^1285001791 is an apocalyptic number.

1285001791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285001791 is an equidigital number, since it uses as much as digits as its factorization.

1285001791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 1285001791 is about 35846.9216391031. The cubic root of 1285001791 is about 1087.1794740593.

The spelling of 1285001791 in words is "one billion, two hundred eighty-five million, one thousand, seven hundred ninety-one".