133252581 has 36 divisors (see below), whose sum is σ = 224167776. Its totient is φ = 68919840.

The previous prime is 133252513. The next prime is 133252649. The reversal of 133252581 is 185252331.

It is an interprime number because it is at equal distance from previous prime (133252513) and next prime (133252649).

It is not a de Polignac number, because 133252581 - 2¹⁴ = 133236197 is a prime.

It is a super-2 number, since 2×133252581² = 35512500686323122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133252181) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 581775 + ... + 582003.

Almost surely, 2^133252581 is an apocalyptic number.

133252581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133252581 is a deficient number, since it is larger than the sum of its proper divisors (90915195).

133252581 is an equidigital number, since it uses as much as digits as its factorization.

133252581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 250 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 133252581 is about 11543.5081755938. The cubic root of 133252581 is about 510.7697986431.

The spelling of 133252581 in words is "one hundred thirty-three million, two hundred fifty-two thousand, five hundred eighty-one".