121780758841 has 9 divisors (see below), whose sum is σ = 141666173391. Its totient is φ = 104381413752.

The previous prime is 121780758839. The next prime is 121780758859. The reversal of 121780758841 is 148857087121.

It is a happy number.

The square root of 121780758841 is 348971.

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., 19766954025 + 102013804816 = 140595^2 + 319396^2 .

It is not a de Polignac number, because 121780758841 - 2¹ = 121780758839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121780758241) 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, 2417871 + ... + 2467723.

Almost surely, 2^121780758841 is an apocalyptic number.

121780758841 is the 348971-st square number.

121780758841 is the 174486-th centered octagonal number.

It is an amenable number.

121780758841 is a deficient number, since it is larger than the sum of its proper divisors (19885414550).

121780758841 is an frugal number, since it uses more digits than its factorization.

121780758841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99720 (or 49860 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 52.

The spelling of 121780758841 in words is "one hundred twenty-one billion, seven hundred eighty million, seven hundred fifty-eight thousand, eight hundred forty-one".