223081987 has 4 divisors (see below), whose sum is σ = 223226640. Its totient is φ = 222937336.

The previous prime is 223081981. The next prime is 223081993. The reversal of 223081987 is 789180322.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (223081981) and next prime (223081993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223081987 is a prime.

It is a super-3 number, since 3×223081987³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (223081981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69988 + ... + 73105.

It is an arithmetic number, because the mean of its divisors is an integer number (55806660).

Almost surely, 2^223081987 is an apocalyptic number.

223081987 is a deficient number, since it is larger than the sum of its proper divisors (144653).

223081987 is a wasteful number, since it uses less digits than its factorization.

223081987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144652.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 223081987 is about 14935.9293986012. The cubic root of 223081987 is about 606.4870071730.

The spelling of 223081987 in words is "two hundred twenty-three million, eighty-one thousand, nine hundred eighty-seven".