228120157 has 2 divisors, whose sum is σ = 228120158. Its totient is φ = 228120156.

The previous prime is 228120107. The next prime is 228120169. The reversal of 228120157 is 751021822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177582276 + 50537881 = 13326^2 + 7109^2 .

It is a cyclic number.

It is not a de Polignac number, because 228120157 - 2⁷ = 228120029 is a prime.

It is equal to p_12544813 and since 228120157 and 12544813 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 (228120107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114060078 + 114060079.

It is an arithmetic number, because the mean of its divisors is an integer number (114060079).

Almost surely, 2^228120157 is an apocalyptic number.

It is an amenable number.

228120157 is a deficient number, since it is larger than the sum of its proper divisors (1).

228120157 is an equidigital number, since it uses as much as digits as its factorization.

228120157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 228120157 is about 15103.6471423296. The cubic root of 228120157 is about 611.0187732577.

Adding to 228120157 its reverse (751021822), we get a palindrome (979141979).

The spelling of 228120157 in words is "two hundred twenty-eight million, one hundred twenty thousand, one hundred fifty-seven".