28951131 has 32 divisors (see below), whose sum is σ = 43819776. Its totient is φ = 16848000.

The previous prime is 28951129. The next prime is 28951157. The reversal of 28951131 is 13115982.

It is not a de Polignac number, because 28951131 - 2¹ = 28951129 is a prime.

It is a super-2 number, since 2×28951131² = 1676335972358322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28951631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159861 + ... + 160041.

It is an arithmetic number, because the mean of its divisors is an integer number (1369368).

Almost surely, 2^28951131 is an apocalyptic number.

28951131 is a deficient number, since it is larger than the sum of its proper divisors (14868645).

28951131 is a wasteful number, since it uses less digits than its factorization.

28951131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363.

The product of its digits is 2160, while the sum is 30.

The square root of 28951131 is about 5380.6255212568. The cubic root of 28951131 is about 307.0590096190.

It can be divided in two parts, 28 and 951131, that added together give a palindrome (951159).

The spelling of 28951131 in words is "twenty-eight million, nine hundred fifty-one thousand, one hundred thirty-one".