28197151 has 4 divisors (see below), whose sum is σ = 28618072. Its totient is φ = 27776232.

The previous prime is 28197137. The next prime is 28197157. The reversal of 28197151 is 15179182.

28197151 = T₄₂₆ + T₄₂₇ + ... + T₆₂₆.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28197151 - 2⁵ = 28197119 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 (28197157) 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, 210360 + ... + 210493.

It is an arithmetic number, because the mean of its divisors is an integer number (7154518).

Almost surely, 2^28197151 is an apocalyptic number.

28197151 is a deficient number, since it is larger than the sum of its proper divisors (420921).

28197151 is an equidigital number, since it uses as much as digits as its factorization.

28197151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420920.

The product of its digits is 5040, while the sum is 34.

The square root of 28197151 is about 5310.0989632963. The cubic root of 28197151 is about 304.3699292486.

The spelling of 28197151 in words is "twenty-eight million, one hundred ninety-seven thousand, one hundred fifty-one".