121554563 has 16 divisors (see below), whose sum is σ = 138492480. Its totient is φ = 105836544.

The previous prime is 121554541. The next prime is 121554569. The reversal of 121554563 is 365455121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121554563 is a prime.

It is a super-2 number, since 2×121554563² = 29551023572241938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121554569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19043 + ... + 24611.

It is an arithmetic number, because the mean of its divisors is an integer number (8655780).

Almost surely, 2^121554563 is an apocalyptic number.

121554563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121554563 is a deficient number, since it is larger than the sum of its proper divisors (16937917).

121554563 is a wasteful number, since it uses less digits than its factorization.

121554563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5678.

The product of its digits is 18000, while the sum is 32.

The square root of 121554563 is about 11025.1785926578. The cubic root of 121554563 is about 495.3632174141.

The spelling of 121554563 in words is "one hundred twenty-one million, five hundred fifty-four thousand, five hundred sixty-three".