121563993 has 8 divisors (see below), whose sum is σ = 169132608. Its totient is φ = 77519024.

The previous prime is 121563983. The next prime is 121563997. The reversal of 121563993 is 399365121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121563993 - 2⁴ = 121563977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121563997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880830 + ... + 880967.

It is an arithmetic number, because the mean of its divisors is an integer number (21141576).

Almost surely, 2^121563993 is an apocalyptic number.

It is an amenable number.

121563993 is a deficient number, since it is larger than the sum of its proper divisors (47568615).

121563993 is a wasteful number, since it uses less digits than its factorization.

121563993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761823.

The product of its digits is 43740, while the sum is 39.

The square root of 121563993 is about 11025.6062418354. The cubic root of 121563993 is about 495.3760268999.

The spelling of 121563993 in words is "one hundred twenty-one million, five hundred sixty-three thousand, nine hundred ninety-three".