133801631 has 2 divisors, whose sum is σ = 133801632. Its totient is φ = 133801630.

The previous prime is 133801601. The next prime is 133801637. The reversal of 133801631 is 136108331.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (136108331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133801631 is a prime.

It is a super-2 number, since 2×133801631² = 35805752916520322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133801631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133801637) 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 as a sum of consecutive naturals, namely, 66900815 + 66900816.

It is an arithmetic number, because the mean of its divisors is an integer number (66900816).

Almost surely, 2^133801631 is an apocalyptic number.

133801631 is a deficient number, since it is larger than the sum of its proper divisors (1).

133801631 is an equidigital number, since it uses as much as digits as its factorization.

133801631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 133801631 is about 11567.2654936247. The cubic root of 133801631 is about 511.4703576002.

Adding to 133801631 its reverse (136108331), we get a palindrome (269909962).

The spelling of 133801631 in words is "one hundred thirty-three million, eight hundred one thousand, six hundred thirty-one".