2145511 has 4 divisors (see below), whose sum is σ = 2148624. Its totient is φ = 2142400.

The previous prime is 2145497. The next prime is 2145529. The reversal of 2145511 is 1155412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2145511 - 2⁹ = 2144999 is a prime.

It is a super-2 number, since 2×2145511² = 9206434902242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145551) 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, 10 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (537156).

2^2145511 is an apocalyptic number.

2145511 is a deficient number, since it is larger than the sum of its proper divisors (3113).

2145511 is a wasteful number, since it uses less digits than its factorization.

2145511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its digits is 200, while the sum is 19.

The square root of 2145511 is about 1464.7562937226. The cubic root of 2145511 is about 128.9763993441.

Subtracting from 2145511 its reverse (1155412), we obtain a palindrome (990099).

The spelling of 2145511 in words is "two million, one hundred forty-five thousand, five hundred eleven".