6995581 has 4 divisors (see below), whose sum is σ = 7001532. Its totient is φ = 6989632.

The previous prime is 6995567. The next prime is 6995617. The reversal of 6995581 is 1855996.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1664100 + 5331481 = 1290^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 6995581 - 2⁹ = 6995069 is a prime.

It is a super-2 number, since 2×6995581² = 97876307055122, 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 (6995501) 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, 556 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (1750383).

Almost surely, 2^6995581 is an apocalyptic number.

It is an amenable number.

6995581 is a deficient number, since it is larger than the sum of its proper divisors (5951).

6995581 is a wasteful number, since it uses less digits than its factorization.

6995581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5950.

The product of its digits is 97200, while the sum is 43.

The square root of 6995581 is about 2644.9160667212. The cubic root of 6995581 is about 191.2528562662.

The spelling of 6995581 in words is "six million, nine hundred ninety-five thousand, five hundred eighty-one".