223542981 has 12 divisors (see below), whose sum is σ = 323407500. Its totient is φ = 148792320.

The previous prime is 223542973. The next prime is 223543031. The reversal of 223542981 is 189245322.

It is a happy number.

223542981 is a `hidden beast` number, since 2 + 23 + 542 + 98 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 162562500 + 60980481 = 12750^2 + 7809^2 .

It is not a de Polignac number, because 223542981 - 2³ = 223542973 is a prime.

It is a super-2 number, since 2×223542981² = 99942928708732722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223542281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13606 + ... + 25143.

It is an arithmetic number, because the mean of its divisors is an integer number (26950625).

Almost surely, 2^223542981 is an apocalyptic number.

It is an amenable number.

223542981 is a deficient number, since it is larger than the sum of its proper divisors (99864519).

223542981 is a wasteful number, since it uses less digits than its factorization.

223542981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39396 (or 39393 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 223542981 is about 14951.3538183002. The cubic root of 223542981 is about 606.9044837388.

The spelling of 223542981 in words is "two hundred twenty-three million, five hundred forty-two thousand, nine hundred eighty-one".