26984561 has 4 divisors (see below), whose sum is σ = 27105792. Its totient is φ = 26863332.

The previous prime is 26984557. The next prime is 26984563. The reversal of 26984561 is 16548962.

It is a happy number.

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 26984561 - 2² = 26984557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26984563) 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, 60281 + ... + 60726.

It is an arithmetic number, because the mean of its divisors is an integer number (6776448).

Almost surely, 2^26984561 is an apocalyptic number.

It is an amenable number.

26984561 is a deficient number, since it is larger than the sum of its proper divisors (121231).

26984561 is a wasteful number, since it uses less digits than its factorization.

26984561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121230.

The product of its digits is 103680, while the sum is 41.

The square root of 26984561 is about 5194.6665918036. Note that the first 3 decimals coincide. The cubic root of 26984561 is about 299.9428076160.

The spelling of 26984561 in words is "twenty-six million, nine hundred eighty-four thousand, five hundred sixty-one".