121618563 has 32 divisors (see below), whose sum is σ = 190218240. Its totient is φ = 68326560.

The previous prime is 121618559. The next prime is 121618597. The reversal of 121618563 is 365816121.

It is not a de Polignac number, because 121618563 - 2² = 121618559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (121618543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27406 + ... + 31532.

It is an arithmetic number, because the mean of its divisors is an integer number (5944320).

Almost surely, 2^121618563 is an apocalyptic number.

121618563 is a deficient number, since it is larger than the sum of its proper divisors (68599677).

121618563 is a wasteful number, since it uses less digits than its factorization.

121618563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207.

The product of its digits is 8640, while the sum is 33.

The square root of 121618563 is about 11028.0806580293. The cubic root of 121618563 is about 495.4501404734.

The spelling of 121618563 in words is "one hundred twenty-one million, six hundred eighteen thousand, five hundred sixty-three".