229931389 has 2 divisors, whose sum is σ = 229931390. Its totient is φ = 229931388.

The previous prime is 229931381. The next prime is 229931479. The reversal of 229931389 is 983139922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194825764 + 35105625 = 13958^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 229931389 - 2³ = 229931381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229931381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114965694 + 114965695.

It is an arithmetic number, because the mean of its divisors is an integer number (114965695).

Almost surely, 2^229931389 is an apocalyptic number.

It is an amenable number.

229931389 is a deficient number, since it is larger than the sum of its proper divisors (1).

229931389 is an equidigital number, since it uses as much as digits as its factorization.

229931389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 229931389 is about 15163.4886816985. The cubic root of 229931389 is about 612.6316376236.

The spelling of 229931389 in words is "two hundred twenty-nine million, nine hundred thirty-one thousand, three hundred eighty-nine".