728122091971 has 2 divisors, whose sum is σ = 728122091972. Its totient is φ = 728122091970.

The previous prime is 728122091899. The next prime is 728122092023. The reversal of 728122091971 is 179190221827.

It is a strong prime.

It is an emirp because it is prime and its reverse (179190221827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728122091971 - 2⁷ = 728122091843 is a prime.

It is not a weakly prime, because it can be changed into another prime (728122011971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364061045985 + 364061045986.

It is an arithmetic number, because the mean of its divisors is an integer number (364061045986).

Almost surely, 2^728122091971 is an apocalyptic number.

728122091971 is a deficient number, since it is larger than the sum of its proper divisors (1).

728122091971 is an equidigital number, since it uses as much as digits as its factorization.

728122091971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 728122091971 in words is "seven hundred twenty-eight billion, one hundred twenty-two million, ninety-one thousand, nine hundred seventy-one".