2861242309 has 16 divisors (see below), whose sum is σ = 2991063040. Its totient is φ = 2733983280.

The previous prime is 2861242289. The next prime is 2861242327. The reversal of 2861242309 is 9032421682.

It is a happy number.

2861242309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2861242309 - 2¹⁵ = 2861209541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861242339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876322 + ... + 879580.

It is an arithmetic number, because the mean of its divisors is an integer number (186941440).

Almost surely, 2^2861242309 is an apocalyptic number.

It is an amenable number.

2861242309 is a deficient number, since it is larger than the sum of its proper divisors (129820731).

2861242309 is a wasteful number, since it uses less digits than its factorization.

2861242309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 2861242309 is about 53490.5814980544. The cubic root of 2861242309 is about 1419.6617439697.

The spelling of 2861242309 in words is "two billion, eight hundred sixty-one million, two hundred forty-two thousand, three hundred nine".