2161115007 has 4 divisors (see below), whose sum is σ = 2881486680. Its totient is φ = 1440743336.

The previous prime is 2161114993. The next prime is 2161115009. The reversal of 2161115007 is 7005111612.

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 2161115007 - 2⁸ = 2161114751 is a prime.

It is a super-2 number, since 2×2161115007² = 9340836146961220098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161115009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360185832 + ... + 360185837.

It is an arithmetic number, because the mean of its divisors is an integer number (720371670).

Almost surely, 2^2161115007 is an apocalyptic number.

2161115007 is a deficient number, since it is larger than the sum of its proper divisors (720371673).

2161115007 is an equidigital number, since it uses as much as digits as its factorization.

2161115007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720371672.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 2161115007 is about 46487.7941722341. The cubic root of 2161115007 is about 1292.8832025870.

Adding to 2161115007 its reverse (7005111612), we get a palindrome (9166226619).

The spelling of 2161115007 in words is "two billion, one hundred sixty-one million, one hundred fifteen thousand, seven".