133531863 has 16 divisors (see below), whose sum is σ = 185436000. Its totient is φ = 85366400.

The previous prime is 133531861. The next prime is 133531873. The reversal of 133531863 is 368135331.

It is a cyclic number.

It is not a de Polignac number, because 133531863 - 2¹ = 133531861 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133531861) 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, 7813 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (11589750).

Almost surely, 2^133531863 is an apocalyptic number.

133531863 is a deficient number, since it is larger than the sum of its proper divisors (51904137).

133531863 is a wasteful number, since it uses less digits than its factorization.

133531863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482.

The product of its digits is 19440, while the sum is 33.

The square root of 133531863 is about 11555.5987728893. The cubic root of 133531863 is about 511.1263877794.

It can be divided in two parts, 133 and 531863, that added together give a triangular number (531996 = T₁₀₃₁).

The spelling of 133531863 in words is "one hundred thirty-three million, five hundred thirty-one thousand, eight hundred sixty-three".