12381577 has 4 divisors (see below), whose sum is σ = 13334020. Its totient is φ = 11429136.

The previous prime is 12381557. The next prime is 12381583. The reversal of 12381577 is 77518321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77518321 = 31 ⋅2500591.

It can be written as a sum of positive squares in 2 ways, for example, as 1498176 + 10883401 = 1224^2 + 3299^2 .

It is a cyclic number.

It is not a de Polignac number, because 12381577 - 2¹¹ = 12379529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12381517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476202 + ... + 476227.

It is an arithmetic number, because the mean of its divisors is an integer number (3333505).

Almost surely, 2^12381577 is an apocalyptic number.

It is an amenable number.

12381577 is a deficient number, since it is larger than the sum of its proper divisors (952443).

12381577 is an equidigital number, since it uses as much as digits as its factorization.

12381577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952442.

The product of its digits is 11760, while the sum is 34.

The square root of 12381577 is about 3518.7465097674. The cubic root of 12381577 is about 231.3442204807.

Adding to 12381577 its reverse (77518321), we get a palindrome (89899898).

The spelling of 12381577 in words is "twelve million, three hundred eighty-one thousand, five hundred seventy-seven".