121723151 has 4 divisors (see below), whose sum is σ = 132788904. Its totient is φ = 110657400.

The previous prime is 121723117. The next prime is 121723159. The reversal of 121723151 is 151327121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121723151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121723159) 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 in 3 ways as a sum of consecutive naturals, for example, 5532860 + ... + 5532881.

It is an arithmetic number, because the mean of its divisors is an integer number (33197226).

Almost surely, 2^121723151 is an apocalyptic number.

121723151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121723151 is a deficient number, since it is larger than the sum of its proper divisors (11065753).

121723151 is a wasteful number, since it uses less digits than its factorization.

121723151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11065752.

The product of its digits is 420, while the sum is 23.

The square root of 121723151 is about 11032.8215339504. The cubic root of 121723151 is about 495.5921234382.

The spelling of 121723151 in words is "one hundred twenty-one million, seven hundred twenty-three thousand, one hundred fifty-one".