228640831 has 2 divisors, whose sum is σ = 228640832. Its totient is φ = 228640830.

The previous prime is 228640801. The next prime is 228640849. The reversal of 228640831 is 138046822.

228640831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228640831 - 2⁵ = 228640799 is a prime.

It is a super-2 number, since 2×228640831² = 104553259200741122, which contains 22 as substring.

It is equal to p_12571945 and since 228640831 and 12571945 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228640801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114320415 + 114320416.

It is an arithmetic number, because the mean of its divisors is an integer number (114320416).

Almost surely, 2^228640831 is an apocalyptic number.

228640831 is a deficient number, since it is larger than the sum of its proper divisors (1).

228640831 is an equidigital number, since it uses as much as digits as its factorization.

228640831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 228640831 is about 15120.8740157439. The cubic root of 228640831 is about 611.4832943116.

The spelling of 228640831 in words is "two hundred twenty-eight million, six hundred forty thousand, eight hundred thirty-one".