133724285 has 4 divisors (see below), whose sum is σ = 160469148. Its totient is φ = 106979424.

The previous prime is 133724263. The next prime is 133724287. The reversal of 133724285 is 582427331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582427331 = 739 ⋅788129.

It can be written as a sum of positive squares in 2 ways, for example, as 46526041 + 87198244 = 6821^2 + 9338^2 .

It is a cyclic number.

It is not a de Polignac number, because 133724285 - 2⁶ = 133724221 is a prime.

It is a super-2 number, since 2×133724285² = 35764368797522450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133724287) 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, 13372424 + ... + 13372433.

It is an arithmetic number, because the mean of its divisors is an integer number (40117287).

Almost surely, 2^133724285 is an apocalyptic number.

It is an amenable number.

133724285 is a deficient number, since it is larger than the sum of its proper divisors (26744863).

133724285 is an equidigital number, since it uses as much as digits as its factorization.

133724285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26744862.

The product of its digits is 40320, while the sum is 35.

The square root of 133724285 is about 11563.9216963796. The cubic root of 133724285 is about 511.3717842838.

The spelling of 133724285 in words is "one hundred thirty-three million, seven hundred twenty-four thousand, two hundred eighty-five".