2391281285 has 8 divisors (see below), whose sum is σ = 3038333976. Its totient is φ = 1800494080.

The previous prime is 2391281237. The next prime is 2391281297. The reversal of 2391281285 is 5821821932.

It can be written as a sum of positive squares in 4 ways, for example, as 15108769 + 2376172516 = 3887^2 + 48746^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2391281285 - 2²⁰ = 2390232709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14066276 + ... + 14066445.

It is an arithmetic number, because the mean of its divisors is an integer number (379791747).

Almost surely, 2^2391281285 is an apocalyptic number.

It is an amenable number.

2391281285 is a deficient number, since it is larger than the sum of its proper divisors (647052691).

2391281285 is a wasteful number, since it uses less digits than its factorization.

2391281285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28132743.

The product of its digits is 69120, while the sum is 41.

The square root of 2391281285 is about 48900.7288800484. The cubic root of 2391281285 is about 1337.2426565183.

The spelling of 2391281285 in words is "two billion, three hundred ninety-one million, two hundred eighty-one thousand, two hundred eighty-five".