121563994 has 8 divisors (see below), whose sum is σ = 184019220. Its totient is φ = 60224256.

The previous prime is 121563983. The next prime is 121563997. The reversal of 121563994 is 499365121.

It can be written as a sum of positive squares in 2 ways, for example, as 119617969 + 1946025 = 10937^2 + 1395^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 278599 + ... + 279034.

Almost surely, 2^121563994 is an apocalyptic number.

121563994 is a deficient number, since it is larger than the sum of its proper divisors (62455226).

121563994 is a wasteful number, since it uses less digits than its factorization.

121563994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557744.

The product of its digits is 58320, while the sum is 40.

The square root of 121563994 is about 11025.6062871844. The cubic root of 121563994 is about 495.3760282582.

The spelling of 121563994 in words is "one hundred twenty-one million, five hundred sixty-three thousand, nine hundred ninety-four".