1285861611 has 4 divisors (see below), whose sum is σ = 1714482152. Its totient is φ = 857241072.

The previous prime is 1285861573. The next prime is 1285861631. The reversal of 1285861611 is 1161685821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1285861611 - 2¹³ = 1285853419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285861611.

It is not an unprimeable number, because it can be changed into a prime (1285861631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214310266 + ... + 214310271.

It is an arithmetic number, because the mean of its divisors is an integer number (428620538).

Almost surely, 2^1285861611 is an apocalyptic number.

1285861611 is a deficient number, since it is larger than the sum of its proper divisors (428620541).

1285861611 is an equidigital number, since it uses as much as digits as its factorization.

1285861611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428620540.

The product of its digits is 23040, while the sum is 39.

The square root of 1285861611 is about 35858.9125741426. The cubic root of 1285861611 is about 1087.4219043932.

The spelling of 1285861611 in words is "one billion, two hundred eighty-five million, eight hundred sixty-one thousand, six hundred eleven".