121931660499289 has 9 divisors (see below), whose sum is σ = 122611047722751. Its totient is φ = 121256017308360.

The previous prime is 121931660499203. The next prime is 121931660499361. The reversal of 121931660499289 is 982994066139121.

It is a happy number.

The square root of 121931660499289 is 11042267.

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

It can be written as a sum of positive squares in only one way, i.e., 1343589311689 + 120588071187600 = 1159133^2 + 10981260^2 .

It is not a de Polignac number, because 121931660499289 - 2⁷ = 121931660499161 is a prime.

It is a super-2 number, since 2×121931660499289² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121931660499589) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1998619824 + ... + 1998680830.

Almost surely, 2^{121931660499289} is an apocalyptic number.

121931660499289 is the 11042267-th square number.

121931660499289 is the 5521134-th centered octagonal number.

It is an amenable number.

121931660499289 is a deficient number, since it is larger than the sum of its proper divisors (679387223462).

121931660499289 is an frugal number, since it uses more digits than its factorization.

121931660499289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122376 (or 61188 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 70.

The spelling of 121931660499289 in words is "one hundred twenty-one trillion, nine hundred thirty-one billion, six hundred sixty million, four hundred ninety-nine thousand, two hundred eighty-nine".