2145591 has 12 divisors (see below), whose sum is σ = 3542032. Its totient is φ = 1226016.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145591 is 1955412.

It is not a de Polignac number, because 2145591 - 2¹¹ = 2143543 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 16966 + ... + 17091.

2^2145591 is an apocalyptic number.

2145591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2145591 is a deficient number, since it is larger than the sum of its proper divisors (1396441).

2145591 is a wasteful number, since it uses less digits than its factorization.

2145591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070 (or 34067 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 2145591 is about 1464.7836017651. The cubic root of 2145591 is about 128.9780023785.

The spelling of 2145591 in words is "two million, one hundred forty-five thousand, five hundred ninety-one".