1285597641 has 4 divisors (see below), whose sum is σ = 1714130192. Its totient is φ = 857065092.

The previous prime is 1285597609. The next prime is 1285597657. The reversal of 1285597641 is 1467955821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1285597641 - 2⁵ = 1285597609 is a prime.

It is a super-2 number, since 2×1285597641² = 3305522589089529762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285597141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214266271 + ... + 214266276.

It is an arithmetic number, because the mean of its divisors is an integer number (428532548).

Almost surely, 2^1285597641 is an apocalyptic number.

It is an amenable number.

1285597641 is a deficient number, since it is larger than the sum of its proper divisors (428532551).

1285597641 is an equidigital number, since it uses as much as digits as its factorization.

1285597641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428532550.

The product of its digits is 604800, while the sum is 48.

The square root of 1285597641 is about 35855.2317103097. The cubic root of 1285597641 is about 1087.3474882969.

The spelling of 1285597641 in words is "one billion, two hundred eighty-five million, five hundred ninety-seven thousand, six hundred forty-one".