121632649 has 2 divisors, whose sum is σ = 121632650. Its totient is φ = 121632648.

The previous prime is 121632631. The next prime is 121632677. The reversal of 121632649 is 946236121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115347600 + 6285049 = 10740^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 121632649 - 2⁵ = 121632617 is a prime.

It is not a weakly prime, because it can be changed into another prime (121632629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60816324 + 60816325.

It is an arithmetic number, because the mean of its divisors is an integer number (60816325).

Almost surely, 2^121632649 is an apocalyptic number.

It is an amenable number.

121632649 is a deficient number, since it is larger than the sum of its proper divisors (1).

121632649 is an equidigital number, since it uses as much as digits as its factorization.

121632649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 121632649 is about 11028.7192819475. The cubic root of 121632649 is about 495.4692676009.

The spelling of 121632649 in words is "one hundred twenty-one million, six hundred thirty-two thousand, six hundred forty-nine".