121943977 has 2 divisors, whose sum is σ = 121943978. Its totient is φ = 121943976.

The previous prime is 121943959. The next prime is 121944023. The reversal of 121943977 is 779349121.

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., 67420521 + 54523456 = 8211^2 + 7384^2 .

It is a cyclic number.

It is not a de Polignac number, because 121943977 - 2¹⁹ = 121419689 is a prime.

It is not a weakly prime, because it can be changed into another prime (121943947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60971988 + 60971989.

It is an arithmetic number, because the mean of its divisors is an integer number (60971989).

Almost surely, 2^121943977 is an apocalyptic number.

It is an amenable number.

121943977 is a deficient number, since it is larger than the sum of its proper divisors (1).

121943977 is an equidigital number, since it uses as much as digits as its factorization.

121943977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 121943977 is about 11042.8246839294. The cubic root of 121943977 is about 495.8916378456.

The spelling of 121943977 in words is "one hundred twenty-one million, nine hundred forty-three thousand, nine hundred seventy-seven".