228131731 has 2 divisors, whose sum is σ = 228131732. Its totient is φ = 228131730.

The previous prime is 228131699. The next prime is 228131747. The reversal of 228131731 is 137131822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228131731 - 2⁵ = 228131699 is a prime.

It is a super-2 number, since 2×228131731² = 104088173378112722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 228131731.

It is not a weakly prime, because it can be changed into another prime (228131131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114065865 + 114065866.

It is an arithmetic number, because the mean of its divisors is an integer number (114065866).

Almost surely, 2^228131731 is an apocalyptic number.

228131731 is a deficient number, since it is larger than the sum of its proper divisors (1).

228131731 is an equidigital number, since it uses as much as digits as its factorization.

228131731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 228131731 is about 15104.0302899590. The cubic root of 228131731 is about 611.0291067179.

Subtracting from 228131731 its reverse (137131822), we obtain a palindrome (90999909).

The spelling of 228131731 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, seven hundred thirty-one".