121515323 has 2 divisors, whose sum is σ = 121515324. Its totient is φ = 121515322.

The previous prime is 121515283. The next prime is 121515347. The reversal of 121515323 is 323515121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121515323 - 2⁶ = 121515259 is a prime.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 60757661 + 60757662.

It is an arithmetic number, because the mean of its divisors is an integer number (60757662).

Almost surely, 2^121515323 is an apocalyptic number.

121515323 is a deficient number, since it is larger than the sum of its proper divisors (1).

121515323 is an equidigital number, since it uses as much as digits as its factorization.

121515323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 121515323 is about 11023.3988860061. The cubic root of 121515323 is about 495.3099076241.

The spelling of 121515323 in words is "one hundred twenty-one million, five hundred fifteen thousand, three hundred twenty-three".