1285320959 has 12 divisors (see below), whose sum is σ = 1408099896. Its totient is φ = 1166299728.

The previous prime is 1285320941. The next prime is 1285320961. The reversal of 1285320959 is 9590235821.

It is not a de Polignac number, because 1285320959 - 2¹² = 1285316863 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 (1285320259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31052 + ... + 59454.

It is an arithmetic number, because the mean of its divisors is an integer number (117341658).

Almost surely, 2^1285320959 is an apocalyptic number.

1285320959 is a deficient number, since it is larger than the sum of its proper divisors (122778937).

1285320959 is an equidigital number, since it uses as much as digits as its factorization.

1285320959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28534 (or 28475 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1285320959 is about 35851.3731815115. The cubic root of 1285320959 is about 1087.2694776106.

The spelling of 1285320959 in words is "one billion, two hundred eighty-five million, three hundred twenty thousand, nine hundred fifty-nine".