12581121 has 16 divisors (see below), whose sum is σ = 19315584. Its totient is φ = 7135104.

The previous prime is 12581119. The next prime is 12581123. The reversal of 12581121 is 12118521.

It is an interprime number because it is at equal distance from previous prime (12581119) and next prime (12581123).

It is not a de Polignac number, because 12581121 - 2¹ = 12581119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12581123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (1207224).

Almost surely, 2^12581121 is an apocalyptic number.

It is an amenable number.

12581121 is a deficient number, since it is larger than the sum of its proper divisors (6734463).

12581121 is a wasteful number, since it uses less digits than its factorization.

12581121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520.

The product of its digits is 160, while the sum is 21.

The square root of 12581121 is about 3546.9875951291. The cubic root of 12581121 is about 232.5803999891.

Adding to 12581121 its reverse (12118521), we get a palindrome (24699642).

The spelling of 12581121 in words is "twelve million, five hundred eighty-one thousand, one hundred twenty-one".