229639442591881 has 81 divisors (see below), whose sum is σ = 275327397182439. Its totient is φ = 190973537891136.

The previous prime is 229639442591879. The next prime is 229639442591899. The reversal of 229639442591881 is 188195244936922.

It is a happy number.

The square root of 229639442591881 is 15153859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 209871459537481 + 19767983054400 = 14486941^2 + 4446120^2 .

It is not a de Polignac number, because 229639442591881 - 2¹ = 229639442591879 is a prime.

It is a super-2 number, since 2×229639442591881² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (229639442591821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 561465629605 + ... + 561465630013.

It is an arithmetic number, because the mean of its divisors is an integer number (3399103668919).

Almost surely, 2^{229639442591881} is an apocalyptic number.

229639442591881 is the 15153859-th square number.

229639442591881 is the 7576930-th centered octagonal number.

It is an amenable number.

229639442591881 is a deficient number, since it is larger than the sum of its proper divisors (45687954590558).

229639442591881 is an frugal number, since it uses more digits than its factorization.

229639442591881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124 (or 562 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 73.

The spelling of 229639442591881 in words is "two hundred twenty-nine trillion, six hundred thirty-nine billion, four hundred forty-two million, five hundred ninety-one thousand, eight hundred eighty-one".