121723159 has 2 divisors, whose sum is σ = 121723160. Its totient is φ = 121723158.

The previous prime is 121723117. The next prime is 121723169. The reversal of 121723159 is 951327121.

It is a strong prime.

It is an emirp because it is prime and its reverse (951327121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121723159 - 2¹⁷ = 121592087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121723159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121723169) 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, 60861579 + 60861580.

It is an arithmetic number, because the mean of its divisors is an integer number (60861580).

Almost surely, 2^121723159 is an apocalyptic number.

121723159 is a deficient number, since it is larger than the sum of its proper divisors (1).

121723159 is an equidigital number, since it uses as much as digits as its factorization.

121723159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 121723159 is about 11032.8218965050. The cubic root of 121723159 is about 495.5921342954.

The spelling of 121723159 in words is "one hundred twenty-one million, seven hundred twenty-three thousand, one hundred fifty-nine".