133806215 has 4 divisors (see below), whose sum is σ = 160567464. Its totient is φ = 107044968.

The previous prime is 133806191. The next prime is 133806217. The reversal of 133806215 is 512608331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512608331 = 743 ⋅689917.

It is a cyclic number.

It is not a de Polignac number, because 133806215 - 2¹⁶ = 133740679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133806217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13380617 + ... + 13380626.

It is an arithmetic number, because the mean of its divisors is an integer number (40141866).

Almost surely, 2^133806215 is an apocalyptic number.

133806215 is a deficient number, since it is larger than the sum of its proper divisors (26761249).

133806215 is an equidigital number, since it uses as much as digits as its factorization.

133806215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26761248.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 133806215 is about 11567.4636372889. The cubic root of 133806215 is about 511.4761984690.

The spelling of 133806215 in words is "one hundred thirty-three million, eight hundred six thousand, two hundred fifteen".