121649306 has 4 divisors (see below), whose sum is σ = 182473962. Its totient is φ = 60824652.

The previous prime is 121649299. The next prime is 121649309. The reversal of 121649306 is 603946121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 33120025 = 9409^2 + 5755^2 .

It is not an unprimeable number, because it can be changed into a prime (121649309) 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, 30412325 + ... + 30412328.

Almost surely, 2^121649306 is an apocalyptic number.

121649306 is a deficient number, since it is larger than the sum of its proper divisors (60824656).

121649306 is an equidigital number, since it uses as much as digits as its factorization.

121649306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60824655.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 121649306 is about 11029.4744208416. The cubic root of 121649306 is about 495.4918839377.

The spelling of 121649306 in words is "one hundred twenty-one million, six hundred forty-nine thousand, three hundred six".