133640249 has 4 divisors (see below), whose sum is σ = 133703760. Its totient is φ = 133576740.

The previous prime is 133640239. The next prime is 133640261. The reversal of 133640249 is 942046331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 942046331 = 67 ⋅14060393.

It is a cyclic number.

It is not a de Polignac number, because 133640249 - 2⁴ = 133640233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133640219) 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, 28487 + ... + 32844.

It is an arithmetic number, because the mean of its divisors is an integer number (33425940).

Almost surely, 2^133640249 is an apocalyptic number.

It is an amenable number.

133640249 is a deficient number, since it is larger than the sum of its proper divisors (63511).

133640249 is an equidigital number, since it uses as much as digits as its factorization.

133640249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63510.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 133640249 is about 11560.2875829280. The cubic root of 133640249 is about 511.2646418293.

The spelling of 133640249 in words is "one hundred thirty-three million, six hundred forty thousand, two hundred forty-nine".