228265297491 has 24 divisors (see below), whose sum is σ = 386229968064. Its totient is φ = 118579374480.

The previous prime is 228265297453. The next prime is 228265297501. The reversal of 228265297491 is 194792562822.

It is not a de Polignac number, because 228265297491 - 2⁷ = 228265297363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228265297891) 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 23 ways as a sum of consecutive naturals, for example, 70581345 + ... + 70584578.

It is an arithmetic number, because the mean of its divisors is an integer number (16092915336).

Almost surely, 2^228265297491 is an apocalyptic number.

228265297491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

228265297491 is a deficient number, since it is larger than the sum of its proper divisors (157964670573).

228265297491 is a wasteful number, since it uses less digits than its factorization.

228265297491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141165951 (or 141165944 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 57.

The spelling of 228265297491 in words is "two hundred twenty-eight billion, two hundred sixty-five million, two hundred ninety-seven thousand, four hundred ninety-one".