989957065 has 4 divisors (see below), whose sum is σ = 1187948484. Its totient is φ = 791965648.

The previous prime is 989957041. The next prime is 989957077. The reversal of 989957065 is 560759989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560759989 = 3907 ⋅143527.

It can be written as a sum of positive squares in 2 ways, for example, as 331931961 + 658025104 = 18219^2 + 25652^2 .

It is a cyclic number.

It is not a de Polignac number, because 989957065 - 2¹⁹ = 989432777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98995702 + ... + 98995711.

It is an arithmetic number, because the mean of its divisors is an integer number (296987121).

Almost surely, 2^989957065 is an apocalyptic number.

It is an amenable number.

989957065 is a deficient number, since it is larger than the sum of its proper divisors (197991419).

989957065 is a wasteful number, since it uses less digits than its factorization.

989957065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197991418.

The product of its (nonzero) digits is 6123600, while the sum is 58.

The square root of 989957065 is about 31463.5831557691. The cubic root of 989957065 is about 996.6410853243.

The spelling of 989957065 in words is "nine hundred eighty-nine million, nine hundred fifty-seven thousand, sixty-five".