2145511945 has 16 divisors (see below), whose sum is σ = 2728440720. Its totient is φ = 1614034944.

The previous prime is 2145511943. The next prime is 2145511987. The reversal of 2145511945 is 5491155412.

It can be written as a sum of positive squares in 8 ways, for example, as 244203129 + 1901308816 = 15627^2 + 43604^2 .

It is not a de Polignac number, because 2145511945 - 2¹ = 2145511943 is a prime.

It is a super-2 number, since 2×2145511945² = 9206443012275366050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2145511943) 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, 92701 + ... + 113509.

It is an arithmetic number, because the mean of its divisors is an integer number (170527545).

Almost surely, 2^2145511945 is an apocalyptic number.

It is an amenable number.

2145511945 is a deficient number, since it is larger than the sum of its proper divisors (582928775).

2145511945 is a wasteful number, since it uses less digits than its factorization.

2145511945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22044.

The product of its digits is 36000, while the sum is 37.

The square root of 2145511945 is about 46319.6712531512. The cubic root of 2145511945 is about 1289.7641828022.

The spelling of 2145511945 in words is "two billion, one hundred forty-five million, five hundred eleven thousand, nine hundred forty-five".