121965977 has 4 divisors (see below), whose sum is σ = 139389696. Its totient is φ = 104542260.

The previous prime is 121965971. The next prime is 121966027. The reversal of 121965977 is 779569121.

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 121965977 - 2⁶ = 121965913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121965971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8711849 + ... + 8711862.

It is an arithmetic number, because the mean of its divisors is an integer number (34847424).

Almost surely, 2^121965977 is an apocalyptic number.

It is an amenable number.

121965977 is a deficient number, since it is larger than the sum of its proper divisors (17423719).

121965977 is an equidigital number, since it uses as much as digits as its factorization.

121965977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17423718.

The product of its digits is 238140, while the sum is 47.

The square root of 121965977 is about 11043.8207609504. The cubic root of 121965977 is about 495.9214574406.

The spelling of 121965977 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, nine hundred seventy-seven".