1285587229 has 4 divisors (see below), whose sum is σ = 1285659900. Its totient is φ = 1285514560.

The previous prime is 1285587203. The next prime is 1285587241. The reversal of 1285587229 is 9227855821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 779247225 + 506340004 = 27915^2 + 22502^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285587229 - 2⁹ = 1285586717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285587299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9339 + ... + 51559.

It is an arithmetic number, because the mean of its divisors is an integer number (321414975).

Almost surely, 2^1285587229 is an apocalyptic number.

It is an amenable number.

1285587229 is a deficient number, since it is larger than the sum of its proper divisors (72671).

1285587229 is an equidigital number, since it uses as much as digits as its factorization.

1285587229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72670.

The product of its digits is 806400, while the sum is 49.

The square root of 1285587229 is about 35855.0865150260. The cubic root of 1285587229 is about 1087.3445528288.

The spelling of 1285587229 in words is "one billion, two hundred eighty-five million, five hundred eighty-seven thousand, two hundred twenty-nine".