989523175021 has 2 divisors, whose sum is σ = 989523175022. Its totient is φ = 989523175020.

The previous prime is 989523174977. The next prime is 989523175049. The reversal of 989523175021 is 120571325989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988125462025 + 1397712996 = 994045^2 + 37386^2 .

It is a cyclic number.

It is not a de Polignac number, because 989523175021 - 2¹³ = 989523166829 is a prime.

It is a super-2 number, since 2×989523175021² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 989523175021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989523175061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494761587510 + 494761587511.

It is an arithmetic number, because the mean of its divisors is an integer number (494761587511).

Almost surely, 2^989523175021 is an apocalyptic number.

It is an amenable number.

989523175021 is a deficient number, since it is larger than the sum of its proper divisors (1).

989523175021 is an equidigital number, since it uses as much as digits as its factorization.

989523175021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 989523175021 in words is "nine hundred eighty-nine billion, five hundred twenty-three million, one hundred seventy-five thousand, twenty-one".