2623581 has 6 divisors (see below), whose sum is σ = 3789630. Its totient is φ = 1749048.

The previous prime is 2623573. The next prime is 2623583. The reversal of 2623581 is 1853262.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 95481 = 1590^2 + 309^2 .

It is not a de Polignac number, because 2623581 - 2³ = 2623573 is a prime.

It is a super-2 number, since 2×2623581² = 13766354527122, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹¹ + 6 + 2¹⁹ + 3⁴ + 5 + 8⁷ + 1 .

It is a Curzon number.

2623581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2623583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145746 + ... + 145763.

It is an arithmetic number, because the mean of its divisors is an integer number (631605).

2^2623581 is an apocalyptic number.

It is an amenable number.

2623581 is a deficient number, since it is larger than the sum of its proper divisors (1166049).

2623581 is a wasteful number, since it uses less digits than its factorization.

2623581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291515 (or 291512 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2623581 is about 1619.7472024980. The cubic root of 2623581 is about 137.9213477457.

The spelling of 2623581 in words is "two million, six hundred twenty-three thousand, five hundred eighty-one".