142491506 has 4 divisors (see below), whose sum is σ = 213737262. Its totient is φ = 71245752.

The previous prime is 142491457. The next prime is 142491511. The reversal of 142491506 is 605194241.

142491506 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, and also an emirpimes, since its reverse is a distinct semiprime: 605194241 = 7759 ⋅77999.

It can be written as a sum of positive squares in only one way, i.e., 132825625 + 9665881 = 11525^2 + 3109^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 35622875 + ... + 35622878.

Almost surely, 2^142491506 is an apocalyptic number.

142491506 is a deficient number, since it is larger than the sum of its proper divisors (71245756).

142491506 is an equidigital number, since it uses as much as digits as its factorization.

142491506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71245755.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 142491506 is about 11936.9806065018. The cubic root of 142491506 is about 522.3115851868.

The spelling of 142491506 in words is "one hundred forty-two million, four hundred ninety-one thousand, five hundred six".