311997093489 has 45 divisors (see below), whose sum is σ = 475435428699. Its totient is φ = 203899297680.

The previous prime is 311997093409. The next prime is 311997093493. The reversal of 311997093489 is 984390799113.

The square root of 311997093489 is 558567.

It is a perfect power (a square), and thus also a powerful number.

311997093489 is a `hidden beast` number, since 31 + 199 + 70 + 9 + 348 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 224917805025 + 87079288464 = 474255^2 + 295092^2 .

It is not a de Polignac number, because 311997093489 - 2⁷ = 311997093361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (311997093409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 266435874 + ... + 266437044.

Almost surely, 2^311997093489 is an apocalyptic number.

311997093489 is the 558567-th square number.

311997093489 is the 279284-th centered octagonal number.

It is an amenable number.

311997093489 is a deficient number, since it is larger than the sum of its proper divisors (163438335210).

311997093489 is an frugal number, since it uses more digits than its factorization.

311997093489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 311997093489 in words is "three hundred eleven billion, nine hundred ninety-seven million, ninety-three thousand, four hundred eighty-nine".