1281564085 has 16 divisors (see below), whose sum is σ = 1596579840. Its totient is φ = 986368320.

The previous prime is 1281564077. The next prime is 1281564103. The reversal of 1281564085 is 5804651821.

It is a happy number.

It is not a de Polignac number, because 1281564085 - 2³ = 1281564077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25420 + ... + 56650.

It is an arithmetic number, because the mean of its divisors is an integer number (99786240).

Almost surely, 2^1281564085 is an apocalyptic number.

It is an amenable number.

1281564085 is a deficient number, since it is larger than the sum of its proper divisors (315015755).

1281564085 is a wasteful number, since it uses less digits than its factorization.

1281564085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31548.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 1281564085 is about 35798.9397189358. The cubic root of 1281564085 is about 1086.2091145304.

The spelling of 1281564085 in words is "one billion, two hundred eighty-one million, five hundred sixty-four thousand, eighty-five".