133663121 has 4 divisors (see below), whose sum is σ = 134341812. Its totient is φ = 132984432.

The previous prime is 133663111. The next prime is 133663147. The reversal of 133663121 is 121366331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121366331 = 23 ⋅5276797.

It can be written as a sum of positive squares in 2 ways, for example, as 131217025 + 2446096 = 11455^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 133663121 - 2¹⁰ = 133662097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133663111) 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, 339050 + ... + 339443.

It is an arithmetic number, because the mean of its divisors is an integer number (33585453).

Almost surely, 2^133663121 is an apocalyptic number.

It is an amenable number.

133663121 is a deficient number, since it is larger than the sum of its proper divisors (678691).

133663121 is an equidigital number, since it uses as much as digits as its factorization.

133663121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678690.

The product of its digits is 1944, while the sum is 26.

The square root of 133663121 is about 11561.2767893516. The cubic root of 133663121 is about 511.2938071393.

The spelling of 133663121 in words is "one hundred thirty-three million, six hundred sixty-three thousand, one hundred twenty-one".