121120561 has 2 divisors, whose sum is σ = 121120562. Its totient is φ = 121120560.

The previous prime is 121120543. The next prime is 121120579. The reversal of 121120561 is 165021121.

It is a balanced prime because it is at equal distance from previous prime (121120543) and next prime (121120579).

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 1874161 = 10920^2 + 1369^2 .

It is an emirp because it is prime and its reverse (165021121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121120561 - 2²³ = 112731953 is a prime.

It is not a weakly prime, because it can be changed into another prime (121120511) 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, 60560280 + 60560281.

It is an arithmetic number, because the mean of its divisors is an integer number (60560281).

Almost surely, 2^121120561 is an apocalyptic number.

It is an amenable number.

121120561 is a deficient number, since it is larger than the sum of its proper divisors (1).

121120561 is an equidigital number, since it uses as much as digits as its factorization.

121120561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 121120561 is about 11005.4786810933. The cubic root of 121120561 is about 494.7729612148.

Adding to 121120561 its reverse (165021121), we get a palindrome (286141682).

The spelling of 121120561 in words is "one hundred twenty-one million, one hundred twenty thousand, five hundred sixty-one".