228105931 has 2 divisors, whose sum is σ = 228105932. Its totient is φ = 228105930.

The previous prime is 228105923. The next prime is 228105979. The reversal of 228105931 is 139501822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228105931 - 2³ = 228105923 is a prime.

It is a super-2 number, since 2×228105931² = 104064631514753522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228105893 and 228105902.

It is not a weakly prime, because it can be changed into another prime (228100931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114052965 + 114052966.

It is an arithmetic number, because the mean of its divisors is an integer number (114052966).

Almost surely, 2^228105931 is an apocalyptic number.

228105931 is a deficient number, since it is larger than the sum of its proper divisors (1).

228105931 is an equidigital number, since it uses as much as digits as its factorization.

228105931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 228105931 is about 15103.1761891332. The cubic root of 228105931 is about 611.0060715688.

The spelling of 228105931 in words is "two hundred twenty-eight million, one hundred five thousand, nine hundred thirty-one".