133131242 has 4 divisors (see below), whose sum is σ = 199696866. Its totient is φ = 66565620.

The previous prime is 133131227. The next prime is 133131247. The reversal of 133131242 is 242131331.

133131242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 132963961 + 167281 = 11531^2 + 409^2 .

It is not an unprimeable number, because it can be changed into a prime (133131247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282809 + ... + 33282812.

Almost surely, 2^133131242 is an apocalyptic number.

133131242 is a deficient number, since it is larger than the sum of its proper divisors (66565624).

133131242 is an equidigital number, since it uses as much as digits as its factorization.

133131242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66565623.

The product of its digits is 432, while the sum is 20.

The square root of 133131242 is about 11538.2512539813. The cubic root of 133131242 is about 510.6147169243.

Adding to 133131242 its reverse (242131331), we get a palindrome (375262573).

It can be divided in two parts, 133 and 131242, that multiplied together give a triangular number (17455186 = T₅₉₀₈).

The spelling of 133131242 in words is "one hundred thirty-three million, one hundred thirty-one thousand, two hundred forty-two".