1285565233 has 4 divisors (see below), whose sum is σ = 1286387200. Its totient is φ = 1284743268.

The previous prime is 1285565231. The next prime is 1285565261. The reversal of 1285565233 is 3325655821.

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 a cyclic number.

It is not a de Polignac number, because 1285565233 - 2¹ = 1285565231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285565231) 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, 408633 + ... + 411766.

It is an arithmetic number, because the mean of its divisors is an integer number (321596800).

Almost surely, 2^1285565233 is an apocalyptic number.

It is an amenable number.

1285565233 is a deficient number, since it is larger than the sum of its proper divisors (821967).

1285565233 is an equidigital number, since it uses as much as digits as its factorization.

1285565233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821966.

The product of its digits is 216000, while the sum is 40.

The square root of 1285565233 is about 35854.7797789918. The cubic root of 1285565233 is about 1087.3383514171.

The spelling of 1285565233 in words is "one billion, two hundred eighty-five million, five hundred sixty-five thousand, two hundred thirty-three".