121819290617 has 2 divisors, whose sum is σ = 121819290618. Its totient is φ = 121819290616.

The previous prime is 121819290613. The next prime is 121819290629. The reversal of 121819290617 is 716092918121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69181624576 + 52637666041 = 263024^2 + 229429^2 .

It is a cyclic number.

It is not a de Polignac number, because 121819290617 - 2² = 121819290613 is a prime.

It is not a weakly prime, because it can be changed into another prime (121819290613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909645308 + 60909645309.

It is an arithmetic number, because the mean of its divisors is an integer number (60909645309).

Almost surely, 2^121819290617 is an apocalyptic number.

It is an amenable number.

121819290617 is a deficient number, since it is larger than the sum of its proper divisors (1).

121819290617 is an equidigital number, since it uses as much as digits as its factorization.

121819290617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 47.

The spelling of 121819290617 in words is "one hundred twenty-one billion, eight hundred nineteen million, two hundred ninety thousand, six hundred seventeen".