281980069 has 16 divisors (see below), whose sum is σ = 336918528. Its totient is φ = 230746032.

The previous prime is 281980063. The next prime is 281980073. The reversal of 281980069 is 960089182.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 281980069 - 2¹⁵ = 281947301 is a prime.

It is a super-2 number, since 2×281980069² = 159025518626489522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281980063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102814 + ... + 105520.

It is an arithmetic number, because the mean of its divisors is an integer number (21057408).

Almost surely, 2^281980069 is an apocalyptic number.

It is an amenable number.

281980069 is a deficient number, since it is larger than the sum of its proper divisors (54938459).

281980069 is a wasteful number, since it uses less digits than its factorization.

281980069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 281980069 is about 16792.2621763716. The cubic root of 281980069 is about 655.7517689664.

The spelling of 281980069 in words is "two hundred eighty-one million, nine hundred eighty thousand, sixty-nine".