121841977 has 2 divisors, whose sum is σ = 121841978. Its totient is φ = 121841976.

The previous prime is 121841959. The next prime is 121841981. The reversal of 121841977 is 779148121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74287161 + 47554816 = 8619^2 + 6896^2 .

It is an emirp because it is prime and its reverse (779148121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121841977 is a prime.

It is not a weakly prime, because it can be changed into another prime (121841947) 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 as a sum of consecutive naturals, namely, 60920988 + 60920989.

It is an arithmetic number, because the mean of its divisors is an integer number (60920989).

Almost surely, 2^121841977 is an apocalyptic number.

It is an amenable number.

121841977 is a deficient number, since it is larger than the sum of its proper divisors (1).

121841977 is an equidigital number, since it uses as much as digits as its factorization.

121841977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 121841977 is about 11038.2053342018. The cubic root of 121841977 is about 495.7533364778.

It can be divided in two parts, 12184 and 1977, that added together give a square (14161 = 119²).

The spelling of 121841977 in words is "one hundred twenty-one million, eight hundred forty-one thousand, nine hundred seventy-seven".