1125581 has 2 divisors, whose sum is σ = 1125582. Its totient is φ = 1125580.

The previous prime is 1125571. The next prime is 1125599. The reversal of 1125581 is 1855211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 885481 + 240100 = 941^2 + 490^2 .

It is an emirp because it is prime and its reverse (1855211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1125581 - 2¹⁴ = 1109197 is a prime.

It is a super-2 number, since 2×1125581² = 2533865175122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562790 + 562791.

It is an arithmetic number, because the mean of its divisors is an integer number (562791).

2^1125581 is an apocalyptic number.

It is an amenable number.

1125581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125581 is an equidigital number, since it uses as much as digits as its factorization.

1125581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 23.

The square root of 1125581 is about 1060.9340224538. The cubic root of 1125581 is about 104.0220922002.

The spelling of 1125581 in words is "one million, one hundred twenty-five thousand, five hundred eighty-one".