1285618801 has 4 divisors (see below), whose sum is σ = 1286666100. Its totient is φ = 1284571504.

The previous prime is 1285618757. The next prime is 1285618811. The reversal of 1285618801 is 1088165821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1088165821 = 167 ⋅6515963.

It can be written as a sum of positive squares in 2 ways, for example, as 1022400625 + 263218176 = 31975^2 + 16224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285618801 - 2¹¹ = 1285616753 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285618811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521806 + ... + 524263.

It is an arithmetic number, because the mean of its divisors is an integer number (321666525).

Almost surely, 2^1285618801 is an apocalyptic number.

It is an amenable number.

1285618801 is a deficient number, since it is larger than the sum of its proper divisors (1047299).

1285618801 is a wasteful number, since it uses less digits than its factorization.

1285618801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047298.

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 1285618801 is about 35855.5267845837. The cubic root of 1285618801 is about 1087.3534539132.

The spelling of 1285618801 in words is "one billion, two hundred eighty-five million, six hundred eighteen thousand, eight hundred one".