121649291 has 2 divisors, whose sum is σ = 121649292. Its totient is φ = 121649290.

The previous prime is 121649243. The next prime is 121649299. The reversal of 121649291 is 192946121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121649291 - 2²⁶ = 54540427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121649299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60824645 + 60824646.

It is an arithmetic number, because the mean of its divisors is an integer number (60824646).

Almost surely, 2^121649291 is an apocalyptic number.

121649291 is a deficient number, since it is larger than the sum of its proper divisors (1).

121649291 is an equidigital number, since it uses as much as digits as its factorization.

121649291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 121649291 is about 11029.4737408455. The cubic root of 121649291 is about 495.4918635721.

The spelling of 121649291 in words is "one hundred twenty-one million, six hundred forty-nine thousand, two hundred ninety-one".