121546561 has 2 divisors, whose sum is σ = 121546562. Its totient is φ = 121546560.

The previous prime is 121546541. The next prime is 121546577. The reversal of 121546561 is 165645121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77986561 + 43560000 = 8831^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 121546561 - 2⁷ = 121546433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121546501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60773280 + 60773281.

It is an arithmetic number, because the mean of its divisors is an integer number (60773281).

Almost surely, 2^121546561 is an apocalyptic number.

It is an amenable number.

121546561 is a deficient number, since it is larger than the sum of its proper divisors (1).

121546561 is an equidigital number, since it uses as much as digits as its factorization.

121546561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 121546561 is about 11024.8156900694. The cubic root of 121546561 is about 495.3523471696.

The spelling of 121546561 in words is "one hundred twenty-one million, five hundred forty-six thousand, five hundred sixty-one".