1285125534 has 128 divisors (see below), whose sum is σ = 3748147200. Its totient is φ = 316211040.

The previous prime is 1285125493. The next prime is 1285125571. The reversal of 1285125534 is 4355215821.

1285125534 is a `hidden beast` number, since 12 + 85 + 12 + 553 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70869 + ... + 87135.

It is an arithmetic number, because the mean of its divisors is an integer number (29282400).

Almost surely, 2^1285125534 is an apocalyptic number.

1285125534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285125534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874073600).

1285125534 is an abundant number, since it is smaller than the sum of its proper divisors (2463021666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285125534 is a wasteful number, since it uses less digits than its factorization.

1285125534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16315 (or 16309 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 1285125534 is about 35848.6475895535. The cubic root of 1285125534 is about 1087.2143706466.

The spelling of 1285125534 in words is "one billion, two hundred eighty-five million, one hundred twenty-five thousand, five hundred thirty-four".