228045991 has 2 divisors, whose sum is σ = 228045992. Its totient is φ = 228045990.

The previous prime is 228045967. The next prime is 228046001. The reversal of 228045991 is 199540822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228045991 - 2⁵ = 228045959 is a prime.

It is a super-2 number, since 2×228045991² = 104009948022344162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228045791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114022995 + 114022996.

It is an arithmetic number, because the mean of its divisors is an integer number (114022996).

Almost surely, 2^228045991 is an apocalyptic number.

228045991 is a deficient number, since it is larger than the sum of its proper divisors (1).

228045991 is an equidigital number, since it uses as much as digits as its factorization.

228045991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 228045991 is about 15101.1917079415. The cubic root of 228045991 is about 610.9525483188.

The spelling of 228045991 in words is "two hundred twenty-eight million, forty-five thousand, nine hundred ninety-one".