121571601 has 12 divisors (see below), whose sum is σ = 166152336. Its totient is φ = 79067680.

The previous prime is 121571561. The next prime is 121571617. The reversal of 121571601 is 106175121.

It is not a de Polignac number, because 121571601 - 2⁷ = 121571473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121571501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7011 + ... + 17096.

It is an arithmetic number, because the mean of its divisors is an integer number (13846028).

Almost surely, 2^121571601 is an apocalyptic number.

It is an amenable number.

121571601 is a deficient number, since it is larger than the sum of its proper divisors (44580735).

121571601 is an equidigital number, since it uses as much as digits as its factorization.

121571601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24192 (or 24151 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 121571601 is about 11025.9512514794. The cubic root of 121571601 is about 495.3863609418.

The spelling of 121571601 in words is "one hundred twenty-one million, five hundred seventy-one thousand, six hundred one".