100228391 has 4 divisors (see below), whose sum is σ = 100254792. Its totient is φ = 100201992.

The previous prime is 100228361. The next prime is 100228397. The reversal of 100228391 is 193822001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193822001 = 103 ⋅1881767.

It is a cyclic number.

It is not a de Polignac number, because 100228391 - 2¹⁸ = 99966247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100228391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100228397) 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, 6305 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (25063698).

Almost surely, 2^100228391 is an apocalyptic number.

100228391 is a deficient number, since it is larger than the sum of its proper divisors (26401).

100228391 is an equidigital number, since it uses as much as digits as its factorization.

100228391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26400.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 100228391 is about 10011.4130371292. The cubic root of 100228391 is about 464.5119803887.

The spelling of 100228391 in words is "one hundred million, two hundred twenty-eight thousand, three hundred ninety-one".