12553381 has 2 divisors, whose sum is σ = 12553382. Its totient is φ = 12553380.

The previous prime is 12553379. The next prime is 12553403. The reversal of 12553381 is 18335521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12013156 + 540225 = 3466^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 12553381 - 2¹ = 12553379 is a prime.

It is a super-2 number, since 2×12553381² = 315174749062322, which contains 22 as substring.

Together with 12553379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12553301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6276690 + 6276691.

It is an arithmetic number, because the mean of its divisors is an integer number (6276691).

Almost surely, 2^12553381 is an apocalyptic number.

It is an amenable number.

12553381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12553381 is an equidigital number, since it uses as much as digits as its factorization.

12553381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 12553381 is about 3543.0750768224. The cubic root of 12553381 is about 232.4093360609.

The spelling of 12553381 in words is "twelve million, five hundred fifty-three thousand, three hundred eighty-one".