228858261 has 4 divisors (see below), whose sum is σ = 305144352. Its totient is φ = 152572172.

The previous prime is 228858143. The next prime is 228858263. The reversal of 228858261 is 162858822.

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.

It is a cyclic number.

It is not a de Polignac number, because 228858261 - 2⁹ = 228857749 is a prime.

It is a super-2 number, since 2×228858261² = 104752207255888242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228858263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38143041 + ... + 38143046.

It is an arithmetic number, because the mean of its divisors is an integer number (76286088).

Almost surely, 2^228858261 is an apocalyptic number.

It is an amenable number.

228858261 is a deficient number, since it is larger than the sum of its proper divisors (76286091).

228858261 is an equidigital number, since it uses as much as digits as its factorization.

228858261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76286090.

The product of its digits is 122880, while the sum is 42.

The square root of 228858261 is about 15128.0620371547. The cubic root of 228858261 is about 611.6770664813.

The spelling of 228858261 in words is "two hundred twenty-eight million, eight hundred fifty-eight thousand, two hundred sixty-one".