2115717881 has 16 divisors (see below), whose sum is σ = 2346796800. Its totient is φ = 1898227968.

The previous prime is 2115717829. The next prime is 2115717931. The reversal of 2115717881 is 1887175112.

It is a cyclic number.

It is not a de Polignac number, because 2115717881 - 2¹⁸ = 2115455737 is a prime.

It is a super-2 number, since 2×2115717881² = 8952524303966260322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2115717181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11786 + ... + 66108.

It is an arithmetic number, because the mean of its divisors is an integer number (146674800).

Almost surely, 2^2115717881 is an apocalyptic number.

It is an amenable number.

2115717881 is a deficient number, since it is larger than the sum of its proper divisors (231078919).

2115717881 is a wasteful number, since it uses less digits than its factorization.

2115717881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54448.

The product of its digits is 31360, while the sum is 41.

The square root of 2115717881 is about 45996.9333869118. The cubic root of 2115717881 is about 1283.7661461530.

The spelling of 2115717881 in words is "two billion, one hundred fifteen million, seven hundred seventeen thousand, eight hundred eighty-one".