12553981 has 4 divisors (see below), whose sum is σ = 13695264. Its totient is φ = 11412700.

The previous prime is 12553943. The next prime is 12553993. The reversal of 12553981 is 18935521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12553981 is a prime.

It is a super-2 number, since 2×12553981² = 315204877896722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12553901) 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, 570625 + ... + 570646.

It is an arithmetic number, because the mean of its divisors is an integer number (3423816).

Almost surely, 2^12553981 is an apocalyptic number.

12553981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12553981 is a deficient number, since it is larger than the sum of its proper divisors (1141283).

12553981 is a wasteful number, since it uses less digits than its factorization.

12553981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141282.

The product of its digits is 10800, while the sum is 34.

The square root of 12553981 is about 3543.1597480215. The cubic root of 12553981 is about 232.4130387388.

The spelling of 12553981 in words is "twelve million, five hundred fifty-three thousand, nine hundred eighty-one".