2115780859 has 4 divisors (see below), whose sum is σ = 2115907920. Its totient is φ = 2115653800.

The previous prime is 2115780839. The next prime is 2115780889. The reversal of 2115780859 is 9580875112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2115780859 - 2¹⁷ = 2115649787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115780809) 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 3 ways as a sum of consecutive naturals, for example, 33967 + ... + 73384.

It is an arithmetic number, because the mean of its divisors is an integer number (528976980).

Almost surely, 2^2115780859 is an apocalyptic number.

2115780859 is a deficient number, since it is larger than the sum of its proper divisors (127061).

2115780859 is a wasteful number, since it uses less digits than its factorization.

2115780859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127060.

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 2115780859 is about 45997.6179709341. The cubic root of 2115780859 is about 1283.7788838661.

The spelling of 2115780859 in words is "two billion, one hundred fifteen million, seven hundred eighty thousand, eight hundred fifty-nine".