11425581 has 24 divisors (see below), whose sum is σ = 17816760. Its totient is φ = 7028736.

The previous prime is 11425537. The next prime is 11425597. The reversal of 11425581 is 18552411.

It can be written as a sum of positive squares in 4 ways, for example, as 1121481 + 10304100 = 1059^2 + 3210^2 .

It is not a de Polignac number, because 11425581 - 2¹⁴ = 11409197 is a prime.

It is a super-2 number, since 2×11425581² = 261087802375122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11425501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7405 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (742365).

Almost surely, 2^11425581 is an apocalyptic number.

It is an amenable number.

11425581 is a deficient number, since it is larger than the sum of its proper divisors (6391179).

11425581 is a wasteful number, since it uses less digits than its factorization.

11425581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485 (or 1482 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 11425581 is about 3380.1746996272. The cubic root of 11425581 is about 225.2299279192.

Adding to 11425581 its reverse (18552411), we get a palindrome (29977992).

The spelling of 11425581 in words is "eleven million, four hundred twenty-five thousand, five hundred eighty-one".