121680049 has 4 divisors (see below), whose sum is σ = 121818736. Its totient is φ = 121541364.

The previous prime is 121680043. The next prime is 121680059. The reversal of 121680049 is 940086121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121680049 - 2⁵ = 121680017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121680049.

It is not an unprimeable number, because it can be changed into a prime (121680043) 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 in 3 ways as a sum of consecutive naturals, for example, 68019 + ... + 69784.

It is an arithmetic number, because the mean of its divisors is an integer number (30454684).

Almost surely, 2^121680049 is an apocalyptic number.

It is an amenable number.

121680049 is a deficient number, since it is larger than the sum of its proper divisors (138687).

121680049 is an equidigital number, since it uses as much as digits as its factorization.

121680049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138686.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 121680049 is about 11030.8680075504. The cubic root of 121680049 is about 495.5336203697.

The spelling of 121680049 in words is "one hundred twenty-one million, six hundred eighty thousand, forty-nine".