228631397 has 2 divisors, whose sum is σ = 228631398. Its totient is φ = 228631396.

The previous prime is 228631391. The next prime is 228631421. The reversal of 228631397 is 793136822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215678596 + 12952801 = 14686^2 + 3599^2 .

It is a cyclic number.

It is not a de Polignac number, because 228631397 - 2⁸ = 228631141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228631391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114315698 + 114315699.

It is an arithmetic number, because the mean of its divisors is an integer number (114315699).

Almost surely, 2^228631397 is an apocalyptic number.

It is an amenable number.

228631397 is a deficient number, since it is larger than the sum of its proper divisors (1).

228631397 is an equidigital number, since it uses as much as digits as its factorization.

228631397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 228631397 is about 15120.5620596590. The cubic root of 228631397 is about 611.4748840133.

The spelling of 228631397 in words is "two hundred twenty-eight million, six hundred thirty-one thousand, three hundred ninety-seven".