121523563 has 16 divisors (see below), whose sum is σ = 146499840. Its totient is φ = 98474400.

The previous prime is 121523491. The next prime is 121523569. The reversal of 121523563 is 365325121.

It is a cyclic number.

It is not a de Polignac number, because 121523563 - 2²⁵ = 87969131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121523569) 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 15 ways as a sum of consecutive naturals, for example, 124668 + ... + 125638.

It is an arithmetic number, because the mean of its divisors is an integer number (9156240).

Almost surely, 2^121523563 is an apocalyptic number.

121523563 is a deficient number, since it is larger than the sum of its proper divisors (24976277).

121523563 is an equidigital number, since it uses as much as digits as its factorization.

121523563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its digits is 5400, while the sum is 28.

The square root of 121523563 is about 11023.7726300936. The cubic root of 121523563 is about 495.3211030884.

Adding to 121523563 its reverse (365325121), we get a palindrome (486848684).

The spelling of 121523563 in words is "one hundred twenty-one million, five hundred twenty-three thousand, five hundred sixty-three".