133355865 has 16 divisors (see below), whose sum is σ = 213772608. Its totient is φ = 70988736.

The previous prime is 133355861. The next prime is 133355923. The reversal of 133355865 is 568553331.

It is a happy number.

It is not a de Polignac number, because 133355865 - 2² = 133355861 is a prime.

It is a super-4 number, since 4×133355865⁴ (a number of 34 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (133355861) 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 15 ways as a sum of consecutive naturals, for example, 79 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (13360788).

Almost surely, 2^133355865 is an apocalyptic number.

133355865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133355865 is a deficient number, since it is larger than the sum of its proper divisors (80416743).

133355865 is a wasteful number, since it uses less digits than its factorization.

133355865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16808.

The product of its digits is 162000, while the sum is 39.

The square root of 133355865 is about 11547.9809923640. The cubic root of 133355865 is about 510.9017303560.

The spelling of 133355865 in words is "one hundred thirty-three million, three hundred fifty-five thousand, eight hundred sixty-five".