133506631 has 2 divisors, whose sum is σ = 133506632. Its totient is φ = 133506630.

The previous prime is 133506623. The next prime is 133506689. The reversal of 133506631 is 136605331.

It is a weak prime.

It is an emirp because it is prime and its reverse (136605331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133506631 - 2³ = 133506623 is a prime.

It is a super-2 number, since 2×133506631² = 35648041041940322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133506631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133506601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66753315 + 66753316.

It is an arithmetic number, because the mean of its divisors is an integer number (66753316).

Almost surely, 2^133506631 is an apocalyptic number.

133506631 is a deficient number, since it is larger than the sum of its proper divisors (1).

133506631 is an equidigital number, since it uses as much as digits as its factorization.

133506631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 133506631 is about 11554.5069561622. The cubic root of 133506631 is about 511.0941918347.

The spelling of 133506631 in words is "one hundred thirty-three million, five hundred six thousand, six hundred thirty-one".