980128771 has 4 divisors (see below), whose sum is σ = 980796544. Its totient is φ = 979461000.

The previous prime is 980128759. The next prime is 980128777. The reversal of 980128771 is 177821089.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177821089 = 11813 ⋅15053.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-980128771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (980128777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331680 + ... + 334621.

It is an arithmetic number, because the mean of its divisors is an integer number (245199136).

Almost surely, 2^980128771 is an apocalyptic number.

980128771 is a deficient number, since it is larger than the sum of its proper divisors (667773).

980128771 is a wasteful number, since it uses less digits than its factorization.

980128771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667772.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 980128771 is about 31307.0083367926. The cubic root of 980128771 is about 993.3318921674.

The spelling of 980128771 in words is "nine hundred eighty million, one hundred twenty-eight thousand, seven hundred seventy-one".