28131351 has 4 divisors (see below), whose sum is σ = 37508472. Its totient is φ = 18754232.

The previous prime is 28131329. The next prime is 28131373. The reversal of 28131351 is 15313182.

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

It is an interprime number because it is at equal distance from previous prime (28131329) and next prime (28131373).

It is a cyclic number.

It is not a de Polignac number, because 28131351 - 2⁵ = 28131319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4688556 + ... + 4688561.

It is an arithmetic number, because the mean of its divisors is an integer number (9377118).

Almost surely, 2^28131351 is an apocalyptic number.

28131351 is a deficient number, since it is larger than the sum of its proper divisors (9377121).

28131351 is an equidigital number, since it uses as much as digits as its factorization.

28131351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9377120.

The product of its digits is 720, while the sum is 24.

The square root of 28131351 is about 5303.8996031222. The cubic root of 28131351 is about 304.1329887610.

It can be divided in two parts, 28131 and 351, that added together give a palindrome (28482).

The spelling of 28131351 in words is "twenty-eight million, one hundred thirty-one thousand, three hundred fifty-one".