2355581 has 2 divisors, whose sum is σ = 2355582. Its totient is φ = 2355580.

The previous prime is 2355559. The next prime is 2355629. The reversal of 2355581 is 1855532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 688900 = 1291^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2355581 - 2⁶ = 2355517 is a prime.

It is a super-2 number, since 2×2355581² = 11097523695122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2355181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1177790 + 1177791.

It is an arithmetic number, because the mean of its divisors is an integer number (1177791).

2^2355581 is an apocalyptic number.

It is an amenable number.

2355581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2355581 is an equidigital number, since it uses as much as digits as its factorization.

2355581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 29.

The square root of 2355581 is about 1534.7902136774. The cubic root of 2355581 is about 133.0554539139.

The spelling of 2355581 in words is "two million, three hundred fifty-five thousand, five hundred eighty-one".