121915 has 8 divisors (see below), whose sum is σ = 150480. Its totient is φ = 94752.

The previous prime is 121909. The next prime is 121921. The reversal of 121915 is 519121.

It is an interprime number because it is at equal distance from previous prime (121909) and next prime (121921).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121915 - 2⁵ = 121883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121892 and 121901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (18810).

2¹²¹⁹¹⁵ is an apocalyptic number.

121915 is a deficient number, since it is larger than the sum of its proper divisors (28565).

121915 is an equidigital number, since it uses as much as digits as its factorization.

121915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 90, while the sum is 19.

The square root of 121915 is about 349.1632855843. The cubic root of 121915 is about 49.5852355899.

The spelling of 121915 in words is "one hundred twenty-one thousand, nine hundred fifteen".