281874984561 has 15 divisors (see below), whose sum is σ = 421079645833. Its totient is φ = 187913470860.

The previous prime is 281874984529. The next prime is 281874984563. The reversal of 281874984561 is 165489478182.

The square root of 281874984561 is 530919.

It is a perfect power (a square), and thus also a powerful number.

281874984561 is a `hidden beast` number, since 2 + 8 + 1 + 87 + 498 + 4 + 5 + 61 = 666.

It is not a de Polignac number, because 281874984561 - 2⁵ = 281874984529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281874984563) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4748776 + ... + 4807766.

Almost surely, 2^281874984561 is an apocalyptic number.

281874984561 is the 530919-th square number.

281874984561 is the 265460-th centered octagonal number.

It is an amenable number.

281874984561 is a deficient number, since it is larger than the sum of its proper divisors (139204661272).

281874984561 is an frugal number, since it uses more digits than its factorization.

281874984561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117994 (or 58994 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 281874984561 in words is "two hundred eighty-one billion, eight hundred seventy-four million, nine hundred eighty-four thousand, five hundred sixty-one".