28931159 has 4 divisors (see below), whose sum is σ = 28964880. Its totient is φ = 28897440.

The previous prime is 28931099. The next prime is 28931191. The reversal of 28931159 is 95113982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95113982 = 2 ⋅47556991.

It is a cyclic number.

It is not a de Polignac number, because 28931159 - 2¹⁶ = 28865623 is a prime.

It is a super-2 number, since 2×28931159² = 1674023922166562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15539 + ... + 17300.

It is an arithmetic number, because the mean of its divisors is an integer number (7241220).

Almost surely, 2^28931159 is an apocalyptic number.

28931159 is a deficient number, since it is larger than the sum of its proper divisors (33721).

28931159 is an equidigital number, since it uses as much as digits as its factorization.

28931159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33720.

The product of its digits is 19440, while the sum is 38.

The square root of 28931159 is about 5378.7692830238. The cubic root of 28931159 is about 306.9883849369.

The spelling of 28931159 in words is "twenty-eight million, nine hundred thirty-one thousand, one hundred fifty-nine".