1285716229 has 4 divisors (see below), whose sum is σ = 1469389984. Its totient is φ = 1102042476.

The previous prime is 1285716217. The next prime is 1285716251. The reversal of 1285716229 is 9226175821.

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 1285716229 - 2¹⁵ = 1285683461 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 (1285716269) 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, 91836867 + ... + 91836880.

It is an arithmetic number, because the mean of its divisors is an integer number (367347496).

Almost surely, 2^1285716229 is an apocalyptic number.

It is an amenable number.

1285716229 is a deficient number, since it is larger than the sum of its proper divisors (183673755).

1285716229 is an equidigital number, since it uses as much as digits as its factorization.

1285716229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183673754.

The product of its digits is 120960, while the sum is 43.

The square root of 1285716229 is about 35856.8853778462. The cubic root of 1285716229 is about 1087.3809208410.

The spelling of 1285716229 in words is "one billion, two hundred eighty-five million, seven hundred sixteen thousand, two hundred twenty-nine".