1285521147 has 12 divisors (see below), whose sum is σ = 1966091400. Its totient is φ = 806601408.

The previous prime is 1285521121. The next prime is 1285521157. The reversal of 1285521147 is 7411255821.

It is a happy number.

1285521147 is a `hidden beast` number, since 12 + 85 + 521 + 1 + 47 = 666.

It is not a de Polignac number, because 1285521147 - 2²² = 1281326843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285521157) 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, 4200897 + ... + 4201202.

It is an arithmetic number, because the mean of its divisors is an integer number (163840950).

Almost surely, 2^1285521147 is an apocalyptic number.

1285521147 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1285521147 is a deficient number, since it is larger than the sum of its proper divisors (680570253).

1285521147 is a wasteful number, since it uses less digits than its factorization.

1285521147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8402122 (or 8402119 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 1285521147 is about 35854.1649881851. The cubic root of 1285521147 is about 1087.3259218789.

Adding to 1285521147 its reverse (7411255821), we get a palindrome (8696776968).

The spelling of 1285521147 in words is "one billion, two hundred eighty-five million, five hundred twenty-one thousand, one hundred forty-seven".