121620617 has 2 divisors, whose sum is σ = 121620618. Its totient is φ = 121620616.

The previous prime is 121620599. The next prime is 121620643. The reversal of 121620617 is 716026121.

It is an a-pointer prime, because the next prime (121620643) can be obtained adding 121620617 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116553616 + 5067001 = 10796^2 + 2251^2 .

It is a cyclic number.

It is not a de Polignac number, because 121620617 - 2¹⁴ = 121604233 is a prime.

It is not a weakly prime, because it can be changed into another prime (121620217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60810308 + 60810309.

It is an arithmetic number, because the mean of its divisors is an integer number (60810309).

Almost surely, 2^121620617 is an apocalyptic number.

It is an amenable number.

121620617 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620617 is an equidigital number, since it uses as much as digits as its factorization.

121620617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 121620617 is about 11028.1737835419. The cubic root of 121620617 is about 495.4529296553.

Adding to 121620617 its reverse (716026121), we get a palindrome (837646738).

The spelling of 121620617 in words is "one hundred twenty-one million, six hundred twenty thousand, six hundred seventeen".