228451213 has 4 divisors (see below), whose sum is σ = 228920800. Its totient is φ = 227981628.

The previous prime is 228451189. The next prime is 228451243. The reversal of 228451213 is 312154822.

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 a de Polignac number, because none of the positive numbers 2^k-228451213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228451243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234063 + ... + 235036.

It is an arithmetic number, because the mean of its divisors is an integer number (57230200).

Almost surely, 2^228451213 is an apocalyptic number.

It is an amenable number.

228451213 is a deficient number, since it is larger than the sum of its proper divisors (469587).

228451213 is an equidigital number, since it uses as much as digits as its factorization.

228451213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469586.

The product of its digits is 3840, while the sum is 28.

The square root of 228451213 is about 15114.6026411547. The cubic root of 228451213 is about 611.3142077045.

It can be divided in two parts, 22 and 8451213, that multiplied together give a triangular number (185926686 = T₁₉₂₈₃).

The spelling of 228451213 in words is "two hundred twenty-eight million, four hundred fifty-one thousand, two hundred thirteen".