133441898209 has 3 divisors (see below), whose sum is σ = 133442263507. Its totient is φ = 133441532912.

The previous prime is 133441898201. The next prime is 133441898221. The reversal of 133441898209 is 902898144331.

The square root of 133441898209 is 365297.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902898144331 = 1831 ⋅493117501.

It can be written as a sum of positive squares in only one way, i.e., 127523981025 + 5917917184 = 357105^2 + 76928^2 .

It is not a de Polignac number, because 133441898209 - 2³ = 133441898201 is a prime.

It is a super-2 number, since 2×133441898209² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133441898201) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 182649 + ... + 547945.

Almost surely, 2^133441898209 is an apocalyptic number.

133441898209 is the 365297-th square number.

133441898209 is the 182649-th centered octagonal number.

It is an amenable number.

133441898209 is a deficient number, since it is larger than the sum of its proper divisors (365298).

133441898209 is an frugal number, since it uses more digits than its factorization.

133441898209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730594 (or 365297 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 133441898209 in words is "one hundred thirty-three billion, four hundred forty-one million, eight hundred ninety-eight thousand, two hundred nine".