121725773987 has 2 divisors, whose sum is σ = 121725773988. Its totient is φ = 121725773986.

The previous prime is 121725773933. The next prime is 121725774017. The reversal of 121725773987 is 789377527121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121725773987 is a prime.

It is not a weakly prime, because it can be changed into another prime (121725773927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60862886993 + 60862886994.

It is an arithmetic number, because the mean of its divisors is an integer number (60862886994).

Almost surely, 2^121725773987 is an apocalyptic number.

121725773987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121725773987 is an equidigital number, since it uses as much as digits as its factorization.

121725773987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10372320, while the sum is 59.

The spelling of 121725773987 in words is "one hundred twenty-one billion, seven hundred twenty-five million, seven hundred seventy-three thousand, nine hundred eighty-seven".