6553981 has 4 divisors (see below), whose sum is σ = 7490272. Its totient is φ = 5617692.

The previous prime is 6553979. The next prime is 6554021. The reversal of 6553981 is 1893556.

6553981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 6553981 - 2¹ = 6553979 is a prime.

It is a super-2 number, since 2×6553981² = 85909333896722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6553981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6553951) 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, 468135 + ... + 468148.

It is an arithmetic number, because the mean of its divisors is an integer number (1872568).

Almost surely, 2^6553981 is an apocalyptic number.

It is an amenable number.

6553981 is a deficient number, since it is larger than the sum of its proper divisors (936291).

6553981 is an equidigital number, since it uses as much as digits as its factorization.

6553981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936290.

The product of its digits is 32400, while the sum is 37.

The square root of 6553981 is about 2560.0744129810. The cubic root of 6553981 is about 187.1407616427.

The spelling of 6553981 in words is "six million, five hundred fifty-three thousand, nine hundred eighty-one".