728122011971 has 2 divisors, whose sum is σ = 728122011972. Its totient is φ = 728122011970.

The previous prime is 728122011959. The next prime is 728122012043. The reversal of 728122011971 is 179110221827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728122011971 - 2³⁰ = 727048270147 is a prime.

It is not a weakly prime, because it can be changed into another prime (728122010971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364061005985 + 364061005986.

It is an arithmetic number, because the mean of its divisors is an integer number (364061005986).

Almost surely, 2^728122011971 is an apocalyptic number.

728122011971 is a deficient number, since it is larger than the sum of its proper divisors (1).

728122011971 is an equidigital number, since it uses as much as digits as its factorization.

728122011971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 41.

The spelling of 728122011971 in words is "seven hundred twenty-eight billion, one hundred twenty-two million, eleven thousand, nine hundred seventy-one".