28942931 has 2 divisors, whose sum is σ = 28942932. Its totient is φ = 28942930.

The previous prime is 28942883. The next prime is 28942951. The reversal of 28942931 is 13924982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28942931 - 2⁶ = 28942867 is a prime.

It is a super-2 number, since 2×28942931² = 1675386509741522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28942951) 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 as a sum of consecutive naturals, namely, 14471465 + 14471466.

It is an arithmetic number, because the mean of its divisors is an integer number (14471466).

Almost surely, 2^28942931 is an apocalyptic number.

28942931 is a deficient number, since it is larger than the sum of its proper divisors (1).

28942931 is an equidigital number, since it uses as much as digits as its factorization.

28942931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 28942931 is about 5379.8634741042. The cubic root of 28942931 is about 307.0300168353.

The spelling of 28942931 in words is "twenty-eight million, nine hundred forty-two thousand, nine hundred thirty-one".