121623563 has 4 divisors (see below), whose sum is σ = 126911568. Its totient is φ = 116335560.

The previous prime is 121623553. The next prime is 121623577. The reversal of 121623563 is 365326121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121623563 - 2¹² = 121619467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121623553) 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, 2643968 + ... + 2644013.

It is an arithmetic number, because the mean of its divisors is an integer number (31727892).

Almost surely, 2^121623563 is an apocalyptic number.

121623563 is a deficient number, since it is larger than the sum of its proper divisors (5288005).

121623563 is an equidigital number, since it uses as much as digits as its factorization.

121623563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288004.

The product of its digits is 6480, while the sum is 29.

The square root of 121623563 is about 11028.3073497251. The cubic root of 121623563 is about 495.4569300531.

Adding to 121623563 its reverse (365326121), we get a palindrome (486949684).

The spelling of 121623563 in words is "one hundred twenty-one million, six hundred twenty-three thousand, five hundred sixty-three".