133391631 has 4 divisors (see below), whose sum is σ = 177855512. Its totient is φ = 88927752.

The previous prime is 133391617. The next prime is 133391653. The reversal of 133391631 is 136193331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136193331 = 3 ⋅45397777.

It is not a de Polignac number, because 133391631 - 2⁹ = 133391119 is a prime.

It is a super-2 number, since 2×133391631² = 35586654441680322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133391681) 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 3 ways as a sum of consecutive naturals, for example, 22231936 + ... + 22231941.

It is an arithmetic number, because the mean of its divisors is an integer number (44463878).

Almost surely, 2^133391631 is an apocalyptic number.

133391631 is a deficient number, since it is larger than the sum of its proper divisors (44463881).

133391631 is an equidigital number, since it uses as much as digits as its factorization.

133391631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44463880.

The product of its digits is 4374, while the sum is 30.

The square root of 133391631 is about 11549.5294709352. The cubic root of 133391631 is about 510.9474008331.

The spelling of 133391631 in words is "one hundred thirty-three million, three hundred ninety-one thousand, six hundred thirty-one".