2571945 has 16 divisors (see below), whose sum is σ = 4136640. Its totient is φ = 1364544.

The previous prime is 2571937. The next prime is 2571949. The reversal of 2571945 is 5491752.

It is not a de Polignac number, because 2571945 - 2³ = 2571937 is a prime.

It is a super-2 number, since 2×2571945² = 13229802166050, which contains 22 as substring.

It is a Curzon number.

2571945 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2571949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3846 + ... + 4464.

It is an arithmetic number, because the mean of its divisors is an integer number (258540).

2^2571945 is an apocalyptic number.

It is an amenable number.

2571945 is a deficient number, since it is larger than the sum of its proper divisors (1564695).

2571945 is a wasteful number, since it uses less digits than its factorization.

2571945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its digits is 12600, while the sum is 33.

The square root of 2571945 is about 1603.7284682888. The cubic root of 2571945 is about 137.0105129837.

The spelling of 2571945 in words is "two million, five hundred seventy-one thousand, nine hundred forty-five".