6561442 has 8 divisors (see below), whose sum is σ = 9876636. Its totient is φ = 3269232.

The previous prime is 6561437. The next prime is 6561461. The reversal of 6561442 is 2441656.

It can be written as a sum of positive squares in 2 ways, for example, as 6446521 + 114921 = 2539^2 + 339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6561442² = 86105042238728, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6561442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5013 + ... + 6184.

Almost surely, 2^6561442 is an apocalyptic number.

6561442 is a deficient number, since it is larger than the sum of its proper divisors (3315194).

6561442 is a wasteful number, since it uses less digits than its factorization.

6561442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11492.

The product of its digits is 5760, while the sum is 28.

The square root of 6561442 is about 2561.5311827108. The cubic root of 6561442 is about 187.2117478991.

It can be divided in two parts, 65614 and 42, that added together give a palindrome (65656).

The spelling of 6561442 in words is "six million, five hundred sixty-one thousand, four hundred forty-two".