133871865 has 16 divisors (see below), whose sum is σ = 214339200. Its totient is φ = 71350272.

The previous prime is 133871861. The next prime is 133871869. The reversal of 133871865 is 568178331.

It is an interprime number because it is at equal distance from previous prime (133871861) and next prime (133871869).

It is not a de Polignac number, because 133871865 - 2² = 133871861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133871861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38676 + ... + 41994.

It is an arithmetic number, because the mean of its divisors is an integer number (13396200).

Almost surely, 2^133871865 is an apocalyptic number.

133871865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133871865 is a deficient number, since it is larger than the sum of its proper divisors (80467335).

133871865 is a wasteful number, since it uses less digits than its factorization.

133871865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016.

The product of its digits is 120960, while the sum is 42.

The square root of 133871865 is about 11570.3009900348. The cubic root of 133871865 is about 511.5598341515.

The spelling of 133871865 in words is "one hundred thirty-three million, eight hundred seventy-one thousand, eight hundred sixty-five".