121508 has 12 divisors (see below), whose sum is σ = 218652. Its totient is φ = 59040.

The previous prime is 121507. The next prime is 121523. The reversal of 121508 is 805121.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 47524 = 272^2 + 218^2 .

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (121501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (18221).

2¹²¹⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

121508 is a deficient number, since it is larger than the sum of its proper divisors (97144).

121508 is a wasteful number, since it uses less digits than its factorization.

121508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 121508 is about 348.5799764760. The cubic root of 121508 is about 49.5299957638.

Adding to 121508 its reverse (805121), we get a palindrome (926629).

The spelling of 121508 in words is "one hundred twenty-one thousand, five hundred eight".