228137431 has 2 divisors, whose sum is σ = 228137432. Its totient is φ = 228137430.

The previous prime is 228137423. The next prime is 228137443. The reversal of 228137431 is 134731822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228137431 - 2³ = 228137423 is a prime.

It is a super-2 number, since 2×228137431² = 104093374846559522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228137393 and 228137402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228137131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114068715 + 114068716.

It is an arithmetic number, because the mean of its divisors is an integer number (114068716).

Almost surely, 2^228137431 is an apocalyptic number.

228137431 is a deficient number, since it is larger than the sum of its proper divisors (1).

228137431 is an equidigital number, since it uses as much as digits as its factorization.

228137431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 228137431 is about 15104.2189801393. The cubic root of 228137431 is about 611.0341956445.

The spelling of 228137431 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, four hundred thirty-one".