135631312 has 10 divisors (see below), whose sum is σ = 262785698. Its totient is φ = 67815648.

The previous prime is 135631267. The next prime is 135631313. The reversal of 135631312 is 213136531.

It can be written as a sum of positive squares in only one way, i.e., 69956496 + 65674816 = 8364^2 + 8104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135631313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4238463 + ... + 4238494.

Almost surely, 2^135631312 is an apocalyptic number.

It is an amenable number.

135631312 is a deficient number, since it is larger than the sum of its proper divisors (127154386).

135631312 is an equidigital number, since it uses as much as digits as its factorization.

135631312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8476965 (or 8476959 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

The square root of 135631312 is about 11646.0856943438. The cubic root of 135631312 is about 513.7911913583.

Adding to 135631312 its reverse (213136531), we get a palindrome (348767843).

The spelling of 135631312 in words is "one hundred thirty-five million, six hundred thirty-one thousand, three hundred twelve".