2115931965 has 24 divisors (see below), whose sum is σ = 3938225760. Its totient is φ = 967282848.

The previous prime is 2115931931. The next prime is 2115931973. The reversal of 2115931965 is 5691395112.

It is not a de Polignac number, because 2115931965 - 2¹⁷ = 2115800893 is a prime.

It is a super-2 number, since 2×2115931965² = 8954336161017522450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1438675 + ... + 1440144.

It is an arithmetic number, because the mean of its divisors is an integer number (164092740).

Almost surely, 2^2115931965 is an apocalyptic number.

It is an amenable number.

2115931965 is a deficient number, since it is larger than the sum of its proper divisors (1822293795).

2115931965 is a wasteful number, since it uses less digits than its factorization.

2115931965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878841 (or 2878834 counting only the distinct ones).

The product of its digits is 72900, while the sum is 42.

The square root of 2115931965 is about 45999.2604831860. The cubic root of 2115931965 is about 1283.8094450138.

The spelling of 2115931965 in words is "two billion, one hundred fifteen million, nine hundred thirty-one thousand, nine hundred sixty-five".