121780060849 has 2 divisors, whose sum is σ = 121780060850. Its totient is φ = 121780060848.

The previous prime is 121780060811. The next prime is 121780060907. The reversal of 121780060849 is 948060087121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121701206449 + 78854400 = 348857^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 121780060849 - 2¹³ = 121780052657 is a prime.

It is a super-2 number, since 2×121780060849² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121780060799 and 121780060808.

It is not a weakly prime, because it can be changed into another prime (121780060249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60890030424 + 60890030425.

It is an arithmetic number, because the mean of its divisors is an integer number (60890030425).

Almost surely, 2^121780060849 is an apocalyptic number.

It is an amenable number.

121780060849 is a deficient number, since it is larger than the sum of its proper divisors (1).

121780060849 is an equidigital number, since it uses as much as digits as its factorization.

121780060849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 121780060849 in words is "one hundred twenty-one billion, seven hundred eighty million, sixty thousand, eight hundred forty-nine".