228138451 has 2 divisors, whose sum is σ = 228138452. Its totient is φ = 228138450.

The previous prime is 228138437. The next prime is 228138479. The reversal of 228138451 is 154831822.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228138451 - 2⁹ = 228137939 is a prime.

It is not a weakly prime, because it can be changed into another prime (228138401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114069225 + 114069226.

It is an arithmetic number, because the mean of its divisors is an integer number (114069226).

Almost surely, 2^228138451 is an apocalyptic number.

228138451 is a deficient number, since it is larger than the sum of its proper divisors (1).

228138451 is an equidigital number, since it uses as much as digits as its factorization.

228138451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 34.

The square root of 228138451 is about 15104.2527455018. The cubic root of 228138451 is about 611.0351062855.

The spelling of 228138451 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, four hundred fifty-one".