121585901 has 4 divisors (see below), whose sum is σ = 121613052. Its totient is φ = 121558752.

The previous prime is 121585873. The next prime is 121585907. The reversal of 121585901 is 109585121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109585121 = 199 ⋅550679.

It can be written as a sum of positive squares in 2 ways, for example, as 11356900 + 110229001 = 3370^2 + 10499^2 .

It is a cyclic number.

It is not a de Polignac number, because 121585901 - 2¹⁴ = 121569517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121585907) 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, 5090 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (30403263).

Almost surely, 2^121585901 is an apocalyptic number.

It is an amenable number.

121585901 is a deficient number, since it is larger than the sum of its proper divisors (27151).

121585901 is an equidigital number, since it uses as much as digits as its factorization.

121585901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27150.

The product of its (nonzero) digits is 3600, while the sum is 32.

The square root of 121585901 is about 11026.5997025375. The cubic root of 121585901 is about 495.4057836446.

The spelling of 121585901 in words is "one hundred twenty-one million, five hundred eighty-five thousand, nine hundred one".