6542981 has 4 divisors (see below), whose sum is σ = 6586464. Its totient is φ = 6499500.

The previous prime is 6542959. The next prime is 6542989. The reversal of 6542981 is 1892456.

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-6542981 is a prime.

It is a super-2 number, since 2×6542981² = 85621200732722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542989) 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, 21515 + ... + 21816.

It is an arithmetic number, because the mean of its divisors is an integer number (1646616).

Almost surely, 2^6542981 is an apocalyptic number.

It is an amenable number.

6542981 is a deficient number, since it is larger than the sum of its proper divisors (43483).

6542981 is a wasteful number, since it uses less digits than its factorization.

6542981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43482.

The product of its digits is 17280, while the sum is 35.

The square root of 6542981 is about 2557.9251357301. The cubic root of 6542981 is about 187.0360059163.

The spelling of 6542981 in words is "six million, five hundred forty-two thousand, nine hundred eighty-one".