2111511997 has 16 divisors (see below), whose sum is σ = 2474416512. Its totient is φ = 1764360000.

The previous prime is 2111511977. The next prime is 2111512031. The reversal of 2111511997 is 7991151112.

It is a cyclic number.

It is not a de Polignac number, because 2111511997 - 2⁷ = 2111511869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111511977) 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, 40122 + ... + 76372.

It is an arithmetic number, because the mean of its divisors is an integer number (154651032).

Almost surely, 2^2111511997 is an apocalyptic number.

It is an amenable number.

2111511997 is a deficient number, since it is larger than the sum of its proper divisors (362904515).

2111511997 is a wasteful number, since it uses less digits than its factorization.

2111511997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36468.

The product of its digits is 5670, while the sum is 37.

The square root of 2111511997 is about 45951.1914644223. The cubic root of 2111511997 is about 1282.9149058020.

The spelling of 2111511997 in words is "two billion, one hundred eleven million, five hundred eleven thousand, nine hundred ninety-seven".