121515243 has 8 divisors (see below), whose sum is σ = 162344448. Its totient is φ = 80848104.

The previous prime is 121515239. The next prime is 121515259. The reversal of 121515243 is 342515121.

It is a happy number.

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

It is not a de Polignac number, because 121515243 - 2² = 121515239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121515223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38755 + ... + 41772.

It is an arithmetic number, because the mean of its divisors is an integer number (20293056).

Almost surely, 2^121515243 is an apocalyptic number.

121515243 is a deficient number, since it is larger than the sum of its proper divisors (40829205).

121515243 is an equidigital number, since it uses as much as digits as its factorization.

121515243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81033.

The product of its digits is 1200, while the sum is 24.

The square root of 121515243 is about 11023.3952573606. The cubic root of 121515243 is about 495.3097989278.

The spelling of 121515243 in words is "one hundred twenty-one million, five hundred fifteen thousand, two hundred forty-three".