284201981 has 16 divisors (see below), whose sum is σ = 345298560. Its totient is φ = 228484800.

The previous prime is 284201969. The next prime is 284202013. The reversal of 284201981 is 189102482.

It is a cyclic number.

It is not a de Polignac number, because 284201981 - 2⁶ = 284201917 is a prime.

It is a super-2 number, since 2×284201981² = 161541532008648722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284203981) 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, 2855 + ... + 24011.

It is an arithmetic number, because the mean of its divisors is an integer number (21581160).

Almost surely, 2^284201981 is an apocalyptic number.

It is an amenable number.

284201981 is a deficient number, since it is larger than the sum of its proper divisors (61096579).

284201981 is a wasteful number, since it uses less digits than its factorization.

284201981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21284.

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

The square root of 284201981 is about 16858.2911648838. The cubic root of 284201981 is about 657.4696355738.

The spelling of 284201981 in words is "two hundred eighty-four million, two hundred one thousand, nine hundred eighty-one".