1285479831 has 4 divisors (see below), whose sum is σ = 1713973112. Its totient is φ = 856986552.

The previous prime is 1285479817. The next prime is 1285479859. The reversal of 1285479831 is 1389745821.

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

It is not a de Polignac number, because 1285479831 - 2⁹ = 1285479319 is a prime.

It is a super-2 number, since 2×1285479831² = 3304916791815577122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285479031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214246636 + ... + 214246641.

It is an arithmetic number, because the mean of its divisors is an integer number (428493278).

Almost surely, 2^1285479831 is an apocalyptic number.

1285479831 is a deficient number, since it is larger than the sum of its proper divisors (428493281).

1285479831 is an equidigital number, since it uses as much as digits as its factorization.

1285479831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428493280.

The product of its digits is 483840, while the sum is 48.

The square root of 1285479831 is about 35853.5888161841. The cubic root of 1285479831 is about 1087.3142730522.

The spelling of 1285479831 in words is "one billion, two hundred eighty-five million, four hundred seventy-nine thousand, eight hundred thirty-one".