228551381 has 2 divisors, whose sum is σ = 228551382. Its totient is φ = 228551380.

The previous prime is 228551371. The next prime is 228551413. The reversal of 228551381 is 183155822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164070481 + 64480900 = 12809^2 + 8030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228551381 is a prime.

It is a super-2 number, since 2×228551381² = 104471467514014322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228551341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114275690 + 114275691.

It is an arithmetic number, because the mean of its divisors is an integer number (114275691).

Almost surely, 2^228551381 is an apocalyptic number.

It is an amenable number.

228551381 is a deficient number, since it is larger than the sum of its proper divisors (1).

228551381 is an equidigital number, since it uses as much as digits as its factorization.

228551381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

The square root of 228551381 is about 15117.9158947257. The cubic root of 228551381 is about 611.4035414011.

The spelling of 228551381 in words is "two hundred twenty-eight million, five hundred fifty-one thousand, three hundred eighty-one".