331189891081 has 27 divisors (see below), whose sum is σ = 406699840269. Its totient is φ = 268873999128.

The previous prime is 331189891031. The next prime is 331189891129. The reversal of 331189891081 is 180198981133.

It is a happy number.

The square root of 331189891081 is 575491.

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

It is not a de Polignac number, because 331189891081 - 2²³ = 331181502473 is a prime.

It is a super-2 number, since 2×331189891081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331189891031) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 76538140 + ... + 76542466.

It is an arithmetic number, because the mean of its divisors is an integer number (15062957047).

Almost surely, 2^331189891081 is an apocalyptic number.

331189891081 is the 575491-st square number.

331189891081 is the 287746-th centered octagonal number.

It is an amenable number.

331189891081 is a deficient number, since it is larger than the sum of its proper divisors (75509949188).

331189891081 is an frugal number, since it uses more digits than its factorization.

331189891081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706 (or 4353 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 52.

The spelling of 331189891081 in words is "three hundred thirty-one billion, one hundred eighty-nine million, eight hundred ninety-one thousand, eighty-one".