121541362609 has 2 divisors, whose sum is σ = 121541362610. Its totient is φ = 121541362608.

The previous prime is 121541362583. The next prime is 121541362643. The reversal of 121541362609 is 906263145121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71665967025 + 49875395584 = 267705^2 + 223328^2 .

It is a cyclic number.

It is not a de Polignac number, because 121541362609 - 2³³ = 112951428017 is a prime.

It is not a weakly prime, because it can be changed into another prime (121541368609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770681304 + 60770681305.

It is an arithmetic number, because the mean of its divisors is an integer number (60770681305).

Almost surely, 2^121541362609 is an apocalyptic number.

It is an amenable number.

121541362609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121541362609 is an equidigital number, since it uses as much as digits as its factorization.

121541362609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 121541362609 in words is "one hundred twenty-one billion, five hundred forty-one million, three hundred sixty-two thousand, six hundred nine".