133245631 has 4 divisors (see below), whose sum is σ = 133990200. Its totient is φ = 132501064.

The previous prime is 133245617. The next prime is 133245649. The reversal of 133245631 is 136542331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133245631 - 2⁵ = 133245599 is a prime.

It is a super-2 number, since 2×133245631² = 35508796361176322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133245631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133245661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372016 + ... + 372373.

It is an arithmetic number, because the mean of its divisors is an integer number (33497550).

Almost surely, 2^133245631 is an apocalyptic number.

133245631 is a deficient number, since it is larger than the sum of its proper divisors (744569).

133245631 is an equidigital number, since it uses as much as digits as its factorization.

133245631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744568.

The product of its digits is 6480, while the sum is 28.

The square root of 133245631 is about 11543.2071366670. The cubic root of 133245631 is about 510.7609184853.

Adding to 133245631 its reverse (136542331), we get a palindrome (269787962).

The spelling of 133245631 in words is "one hundred thirty-three million, two hundred forty-five thousand, six hundred thirty-one".