2355561 has 20 divisors (see below), whose sum is σ = 3791172. Its totient is φ = 1448928.

The previous prime is 2355559. The next prime is 2355581. The reversal of 2355561 is 1655532.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 1265625 = 1044^2 + 1125^2 .

It is not a de Polignac number, because 2355561 - 2¹ = 2355559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2²¹ + 3¹¹ + 5 + 5⁵ + 5⁷ + 6 + 1 .

It is not an unprimeable number, because it can be changed into a prime (2355581) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66 + ... + 2171.

2^2355561 is an apocalyptic number.

It is an amenable number.

2355561 is a deficient number, since it is larger than the sum of its proper divisors (1435611).

2355561 is a wasteful number, since it uses less digits than its factorization.

2355561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262 (or 2253 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 2355561 is about 1534.7836981151. The cubic root of 2355561 is about 133.0550773449.

It can be divided in two parts, 2355 and 561, that added together give a square (2916 = 54²).

The spelling of 2355561 in words is "two million, three hundred fifty-five thousand, five hundred sixty-one".