2403581 has 2 divisors, whose sum is σ = 2403582. Its totient is φ = 2403580.

The previous prime is 2403553. The next prime is 2403587. The reversal of 2403581 is 1853042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2374681 + 28900 = 1541^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2403581 - 2⁶ = 2403517 is a prime.

It is a super-2 number, since 2×2403581² = 11554403247122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2403587) 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 as a sum of consecutive naturals, namely, 1201790 + 1201791.

It is an arithmetic number, because the mean of its divisors is an integer number (1201791).

2^2403581 is an apocalyptic number.

It is an amenable number.

2403581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2403581 is an equidigital number, since it uses as much as digits as its factorization.

2403581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2403581 is about 1550.3486704609. The cubic root of 2403581 is about 133.9531469078.

The spelling of 2403581 in words is "two million, four hundred three thousand, five hundred eighty-one".