281861261 has 8 divisors (see below), whose sum is σ = 313287264. Its totient is φ = 251402320.

The previous prime is 281861243. The next prime is 281861287. The reversal of 281861261 is 162168182.

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

It is not a de Polignac number, because 281861261 - 2²⁶ = 214752397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281861201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241151 + ... + 242316.

It is an arithmetic number, because the mean of its divisors is an integer number (39160908).

Almost surely, 2^281861261 is an apocalyptic number.

It is an amenable number.

281861261 is a deficient number, since it is larger than the sum of its proper divisors (31426003).

281861261 is a wasteful number, since it uses less digits than its factorization.

281861261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483531.

The product of its digits is 9216, while the sum is 35.

The square root of 281861261 is about 16788.7242219294. The cubic root of 281861261 is about 655.6596590277.

The spelling of 281861261 in words is "two hundred eighty-one million, eight hundred sixty-one thousand, two hundred sixty-one".