228311971 has 2 divisors, whose sum is σ = 228311972. Its totient is φ = 228311970.

The previous prime is 228311933. The next prime is 228311977. The reversal of 228311971 is 179113822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228311971 - 2¹¹ = 228309923 is a prime.

It is a super-2 number, since 2×228311971² = 104252712203809682, which contains 22 as substring.

It is equal to p_12554845 and since 228311971 and 12554845 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (228311977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114155985 + 114155986.

It is an arithmetic number, because the mean of its divisors is an integer number (114155986).

Almost surely, 2^228311971 is an apocalyptic number.

228311971 is a deficient number, since it is larger than the sum of its proper divisors (1).

228311971 is an equidigital number, since it uses as much as digits as its factorization.

228311971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 228311971 is about 15109.9957313032. The cubic root of 228311971 is about 611.1899829135.

The spelling of 228311971 in words is "two hundred twenty-eight million, three hundred eleven thousand, nine hundred seventy-one".