121641578 has 8 divisors (see below), whose sum is σ = 182510820. Its totient is φ = 60804640.

The previous prime is 121641577. The next prime is 121641581. The reversal of 121641578 is 875146121.

It can be written as a sum of positive squares in 2 ways, for example, as 121374289 + 267289 = 11017^2 + 517^2 .

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 (121641577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6878 + ... + 17046.

Almost surely, 2^121641578 is an apocalyptic number.

121641578 is a deficient number, since it is larger than the sum of its proper divisors (60869242).

121641578 is a wasteful number, since it uses less digits than its factorization.

121641578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16152.

The product of its digits is 13440, while the sum is 35.

The square root of 121641578 is about 11029.1240812677. The cubic root of 121641578 is about 495.4813913656.

Adding to 121641578 its reverse (875146121), we get a palindrome (996787699).

The spelling of 121641578 in words is "one hundred twenty-one million, six hundred forty-one thousand, five hundred seventy-eight".