989523174977 has 2 divisors, whose sum is σ = 989523174978. Its totient is φ = 989523174976.

The previous prime is 989523174971. The next prime is 989523175021. The reversal of 989523174977 is 779471325989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755367836161 + 234155338816 = 869119^2 + 483896^2 .

It is a cyclic number.

It is not a de Polignac number, because 989523174977 - 2¹⁶ = 989523109441 is a prime.

It is a super-2 number, since 2×989523174977² (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 989523174977.

It is not a weakly prime, because it can be changed into another prime (989523174971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494761587488 + 494761587489.

It is an arithmetic number, because the mean of its divisors is an integer number (494761587489).

Almost surely, 2^989523174977 is an apocalyptic number.

It is an amenable number.

989523174977 is a deficient number, since it is larger than the sum of its proper divisors (1).

989523174977 is an equidigital number, since it uses as much as digits as its factorization.

989523174977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240045120, while the sum is 71.

The spelling of 989523174977 in words is "nine hundred eighty-nine billion, five hundred twenty-three million, one hundred seventy-four thousand, nine hundred seventy-seven".