28961291999 has 2 divisors, whose sum is σ = 28961292000. Its totient is φ = 28961291998.

The previous prime is 28961291969. The next prime is 28961292023. The reversal of 28961291999 is 99919216982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28961291999 - 2²⁴ = 28944514783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28961291929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480645999 + 14480646000.

It is an arithmetic number, because the mean of its divisors is an integer number (14480646000).

Almost surely, 2^28961291999 is an apocalyptic number.

28961291999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961291999 is an equidigital number, since it uses as much as digits as its factorization.

28961291999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11337408, while the sum is 65.

The spelling of 28961291999 in words is "twenty-eight billion, nine hundred sixty-one million, two hundred ninety-one thousand, nine hundred ninety-nine".