228621973 has 2 divisors, whose sum is σ = 228621974. Its totient is φ = 228621972.

The previous prime is 228621949. The next prime is 228622033. The reversal of 228621973 is 379126822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225991089 + 2630884 = 15033^2 + 1622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228621973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228625973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114310986 + 114310987.

It is an arithmetic number, because the mean of its divisors is an integer number (114310987).

Almost surely, 2^228621973 is an apocalyptic number.

It is an amenable number.

228621973 is a deficient number, since it is larger than the sum of its proper divisors (1).

228621973 is an equidigital number, since it uses as much as digits as its factorization.

228621973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 228621973 is about 15120.2504278203. The cubic root of 228621973 is about 611.4664823990.

The spelling of 228621973 in words is "two hundred twenty-eight million, six hundred twenty-one thousand, nine hundred seventy-three".