2107915945 has 4 divisors (see below), whose sum is σ = 2529499140. Its totient is φ = 1686332752.

The previous prime is 2107915933. The next prime is 2107915949. The reversal of 2107915945 is 5495197012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 645312409 + 1462603536 = 25403^2 + 38244^2 .

It is a cyclic number.

It is not a de Polignac number, because 2107915945 - 2⁵ = 2107915913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2107915949) 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, 210791590 + ... + 210791599.

It is an arithmetic number, because the mean of its divisors is an integer number (632374785).

Almost surely, 2^2107915945 is an apocalyptic number.

It is an amenable number.

2107915945 is a deficient number, since it is larger than the sum of its proper divisors (421583195).

2107915945 is an equidigital number, since it uses as much as digits as its factorization.

2107915945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421583194.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 2107915945 is about 45912.0457505435. The cubic root of 2107915945 is about 1282.1861941494.

The spelling of 2107915945 in words is "two billion, one hundred seven million, nine hundred fifteen thousand, nine hundred forty-five".