228145131 has 6 divisors (see below), whose sum is σ = 329542980. Its totient is φ = 152096748.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145131 is 131541822.

It is not a de Polignac number, because 228145131 - 2³ = 228145123 is a prime.

It is a super-2 number, since 2×228145131² = 104100401598014322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228145095 and 228145104.

It is not an unprimeable number, because it can be changed into a prime (228145111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12674721 + ... + 12674738.

It is an arithmetic number, because the mean of its divisors is an integer number (54923830).

Almost surely, 2^228145131 is an apocalyptic number.

228145131 is a deficient number, since it is larger than the sum of its proper divisors (101397849).

228145131 is a wasteful number, since it uses less digits than its factorization.

228145131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25349465 (or 25349462 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 228145131 is about 15104.4738736574. The cubic root of 228145131 is about 611.0410700247.

Adding to 228145131 its reverse (131541822), we get a palindrome (359686953).

The spelling of 228145131 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred thirty-one".