121505291 has 2 divisors, whose sum is σ = 121505292. Its totient is φ = 121505290.

The previous prime is 121505287. The next prime is 121505303. The reversal of 121505291 is 192505121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121505291 - 2² = 121505287 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121505291.

It is not a weakly prime, because it can be changed into another prime (121505261) 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, 60752645 + 60752646.

It is an arithmetic number, because the mean of its divisors is an integer number (60752646).

Almost surely, 2^121505291 is an apocalyptic number.

121505291 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505291 is an equidigital number, since it uses as much as digits as its factorization.

121505291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 121505291 is about 11022.9438445453. The cubic root of 121505291 is about 495.2962767348.

The spelling of 121505291 in words is "one hundred twenty-one million, five hundred five thousand, two hundred ninety-one".