121920949 has 4 divisors (see below), whose sum is σ = 123177964. Its totient is φ = 120663936.

The previous prime is 121920947. The next prime is 121920971. The reversal of 121920949 is 949029121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41190724 + 80730225 = 6418^2 + 8985^2 .

It is a cyclic number.

It is not a de Polignac number, because 121920949 - 2¹ = 121920947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121920943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628362 + ... + 628555.

It is an arithmetic number, because the mean of its divisors is an integer number (30794491).

Almost surely, 2^121920949 is an apocalyptic number.

It is an amenable number.

121920949 is a deficient number, since it is larger than the sum of its proper divisors (1257015).

121920949 is an equidigital number, since it uses as much as digits as its factorization.

121920949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257014.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 121920949 is about 11041.7819666936. The cubic root of 121920949 is about 495.8604210201.

The spelling of 121920949 in words is "one hundred twenty-one million, nine hundred twenty thousand, nine hundred forty-nine".