121571617 has 2 divisors, whose sum is σ = 121571618. Its totient is φ = 121571616.

The previous prime is 121571561. The next prime is 121571623. The reversal of 121571617 is 716175121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112275216 + 9296401 = 10596^2 + 3049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121571617 is a prime.

It is equal to p_6926035 and since 121571617 and 6926035 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (121571627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60785808 + 60785809.

It is an arithmetic number, because the mean of its divisors is an integer number (60785809).

Almost surely, 2^121571617 is an apocalyptic number.

It is an amenable number.

121571617 is a deficient number, since it is larger than the sum of its proper divisors (1).

121571617 is an equidigital number, since it uses as much as digits as its factorization.

121571617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 31.

The square root of 121571617 is about 11025.9519770403. The cubic root of 121571617 is about 495.3863826743.

The spelling of 121571617 in words is "one hundred twenty-one million, five hundred seventy-one thousand, six hundred seventeen".