228512381 has 4 divisors (see below), whose sum is σ = 228544512. Its totient is φ = 228480252.

The previous prime is 228512371. The next prime is 228512387. The reversal of 228512381 is 183215822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228512381 is a prime.

It is a super-2 number, since 2×228512381² = 104435816540578322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228512387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 21378.

It is an arithmetic number, because the mean of its divisors is an integer number (57136128).

Almost surely, 2^228512381 is an apocalyptic number.

It is an amenable number.

228512381 is a deficient number, since it is larger than the sum of its proper divisors (32131).

228512381 is a wasteful number, since it uses less digits than its factorization.

228512381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32130.

The product of its digits is 7680, while the sum is 32.

The square root of 228512381 is about 15116.6259793646. The cubic root of 228512381 is about 611.3687627962.

The spelling of 228512381 in words is "two hundred twenty-eight million, five hundred twelve thousand, three hundred eighty-one".