133563121 has 4 divisors (see below), whose sum is σ = 133588852. Its totient is φ = 133537392.

The previous prime is 133563109. The next prime is 133563137. The reversal of 133563121 is 121365331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121365331 = 19 ⋅6387649.

It can be written as a sum of positive squares in 2 ways, for example, as 75498721 + 58064400 = 8689^2 + 7620^2 .

It is a cyclic number.

It is not a de Polignac number, because 133563121 - 2¹⁷ = 133432049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133563161) 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, 2046 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (33397213).

Almost surely, 2^133563121 is an apocalyptic number.

It is an amenable number.

133563121 is a deficient number, since it is larger than the sum of its proper divisors (25731).

133563121 is an equidigital number, since it uses as much as digits as its factorization.

133563121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25730.

The product of its digits is 1620, while the sum is 25.

The square root of 133563121 is about 11556.9511983049. The cubic root of 133563121 is about 511.1662672553.

The spelling of 133563121 in words is "one hundred thirty-three million, five hundred sixty-three thousand, one hundred twenty-one".