2115616381 has 8 divisors (see below), whose sum is σ = 2193040800. Its totient is φ = 2038490160.

The previous prime is 2115616379. The next prime is 2115616403. The reversal of 2115616381 is 1836165112.

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

It is a cyclic number.

It is not a de Polignac number, because 2115616381 - 2¹ = 2115616379 is a prime.

It is a super-2 number, since 2×2115616381² = 8951665343111074322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115616681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60051 + ... + 88528.

It is an arithmetic number, because the mean of its divisors is an integer number (274130100).

Almost surely, 2^2115616381 is an apocalyptic number.

It is an amenable number.

2115616381 is a deficient number, since it is larger than the sum of its proper divisors (77424419).

2115616381 is a wasteful number, since it uses less digits than its factorization.

2115616381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149099.

The product of its digits is 8640, while the sum is 34.

The square root of 2115616381 is about 45995.8300392546. The cubic root of 2115616381 is about 1283.7456165810.

The spelling of 2115616381 in words is "two billion, one hundred fifteen million, six hundred sixteen thousand, three hundred eighty-one".