133245531 has 24 divisors (see below), whose sum is σ = 198053856. Its totient is φ = 86271360.

The previous prime is 133245529. The next prime is 133245557. The reversal of 133245531 is 135542331.

It is not a de Polignac number, because 133245531 - 2¹ = 133245529 is a prime.

It is a super-2 number, since 2×133245531² = 35508743062943922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133245495 and 133245504.

It is not an unprimeable number, because it can be changed into a prime (133245521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96361 + ... + 97733.

It is an arithmetic number, because the mean of its divisors is an integer number (8252244).

Almost surely, 2^133245531 is an apocalyptic number.

133245531 is a deficient number, since it is larger than the sum of its proper divisors (64808325).

133245531 is a wasteful number, since it uses less digits than its factorization.

133245531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683 (or 1680 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 133245531 is about 11543.2028051144. The cubic root of 133245531 is about 510.7607907110.

Adding to 133245531 its reverse (135542331), we get a palindrome (268787862).

It can be divided in two parts, 133 and 245531, that multiplied together give a palindrome (32655623).

The spelling of 133245531 in words is "one hundred thirty-three million, two hundred forty-five thousand, five hundred thirty-one".