133690815 has 12 divisors (see below), whose sum is σ = 231730824. Its totient is φ = 71301744.

The previous prime is 133690793. The next prime is 133690849. The reversal of 133690815 is 518096331.

It is a happy number.

It is not a de Polignac number, because 133690815 - 2⁹ = 133690303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133690815.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1485409 + ... + 1485498.

It is an arithmetic number, because the mean of its divisors is an integer number (19310902).

Almost surely, 2^133690815 is an apocalyptic number.

133690815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133690815 is a deficient number, since it is larger than the sum of its proper divisors (98040009).

133690815 is a wasteful number, since it uses less digits than its factorization.

133690815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970918 (or 2970915 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 133690815 is about 11562.4744324042. The cubic root of 133690815 is about 511.3291167863.

The spelling of 133690815 in words is "one hundred thirty-three million, six hundred ninety thousand, eight hundred fifteen".