28909130031091 has 2 divisors, whose sum is σ = 28909130031092. Its totient is φ = 28909130031090.

The previous prime is 28909130031071. The next prime is 28909130031137. The reversal of 28909130031091 is 19013003190982.

It is an a-pointer prime, because the next prime (28909130031137) can be obtained adding 28909130031091 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28909130031091 - 2³⁹ = 28359374217203 is a prime.

It is not a weakly prime, because it can be changed into another prime (28909130031011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14454565015545 + 14454565015546.

It is an arithmetic number, because the mean of its divisors is an integer number (14454565015546).

Almost surely, 2^{28909130031091} is an apocalyptic number.

28909130031091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28909130031091 is an equidigital number, since it uses as much as digits as its factorization.

28909130031091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 28909130031091 in words is "twenty-eight trillion, nine hundred nine billion, one hundred thirty million, thirty-one thousand, ninety-one".