281479661 has 8 divisors (see below), whose sum is σ = 301885920. Its totient is φ = 261632592.

The previous prime is 281479631. The next prime is 281479673. The reversal of 281479661 is 166974182.

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

It is not a de Polignac number, because 281479661 - 2¹⁴ = 281463277 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 (281479631) 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, 138755 + ... + 140768.

It is an arithmetic number, because the mean of its divisors is an integer number (37735740).

Almost surely, 2^281479661 is an apocalyptic number.

It is an amenable number.

281479661 is a deficient number, since it is larger than the sum of its proper divisors (20406259).

281479661 is a wasteful number, since it uses less digits than its factorization.

281479661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279595.

The product of its digits is 145152, while the sum is 44.

The square root of 281479661 is about 16777.3556021204. The cubic root of 281479661 is about 655.3636354668.

The spelling of 281479661 in words is "two hundred eighty-one million, four hundred seventy-nine thousand, six hundred sixty-one".