2945581 has 8 divisors (see below), whose sum is σ = 3029400. Its totient is φ = 2862912.

The previous prime is 2945531. The next prime is 2945609. The reversal of 2945581 is 1855492.

It can be written as a sum of positive squares in 4 ways, for example, as 275625 + 2669956 = 525^2 + 1634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2945581 - 2⁹ = 2945069 is a prime.

It is a super-2 number, since 2×2945581² = 17352894855122, 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 (2945531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7711 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (378675).

2^2945581 is an apocalyptic number.

It is an amenable number.

2945581 is a deficient number, since it is larger than the sum of its proper divisors (83819).

2945581 is a wasteful number, since it uses less digits than its factorization.

2945581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its digits is 14400, while the sum is 34.

The square root of 2945581 is about 1716.2695009817. The cubic root of 2945581 is about 143.3475660406.

The spelling of 2945581 in words is "two million, nine hundred forty-five thousand, five hundred eighty-one".