1281258285 has 16 divisors (see below), whose sum is σ = 2050621056. Its totient is φ = 683135168.

The previous prime is 1281258281. The next prime is 1281258287. The reversal of 1281258285 is 5828521821.

It is a cyclic number.

It is not a de Polignac number, because 1281258285 - 2² = 1281258281 is a prime.

It is a super-2 number, since 2×1281258285² = 3283245585762282450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281258281) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 49447 + ... + 70763.

It is an arithmetic number, because the mean of its divisors is an integer number (128163816).

Almost surely, 2^1281258285 is an apocalyptic number.

1281258285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281258285 is a deficient number, since it is larger than the sum of its proper divisors (769362771).

1281258285 is a wasteful number, since it uses less digits than its factorization.

1281258285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25332.

The product of its digits is 102400, while the sum is 42.

The square root of 1281258285 is about 35794.6683879038. The cubic root of 1281258285 is about 1086.1227125122.

The spelling of 1281258285 in words is "one billion, two hundred eighty-one million, two hundred fifty-eight thousand, two hundred eighty-five".