121723997 has 2 divisors, whose sum is σ = 121723998. Its totient is φ = 121723996.

The previous prime is 121723993. The next prime is 121724041. The reversal of 121723997 is 799327121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121572676 + 151321 = 11026^2 + 389^2 .

It is an emirp because it is prime and its reverse (799327121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121723997 - 2² = 121723993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121723993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60861998 + 60861999.

It is an arithmetic number, because the mean of its divisors is an integer number (60861999).

Almost surely, 2^121723997 is an apocalyptic number.

It is an amenable number.

121723997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121723997 is an equidigital number, since it uses as much as digits as its factorization.

121723997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 41.

The square root of 121723997 is about 11032.8598740308. The cubic root of 121723997 is about 495.5932715900.

The spelling of 121723997 in words is "one hundred twenty-one million, seven hundred twenty-three thousand, nine hundred ninety-seven".