228631687 has 2 divisors, whose sum is σ = 228631688. Its totient is φ = 228631686.

The previous prime is 228631643. The next prime is 228631723. The reversal of 228631687 is 786136822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228631687 - 2¹⁵ = 228598919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228631607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114315843 + 114315844.

It is an arithmetic number, because the mean of its divisors is an integer number (114315844).

Almost surely, 2^228631687 is an apocalyptic number.

228631687 is a deficient number, since it is larger than the sum of its proper divisors (1).

228631687 is an equidigital number, since it uses as much as digits as its factorization.

228631687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 228631687 is about 15120.5716492466. The cubic root of 228631687 is about 611.4751425483.

The spelling of 228631687 in words is "two hundred twenty-eight million, six hundred thirty-one thousand, six hundred eighty-seven".