142491 has 4 divisors (see below), whose sum is σ = 189992. Its totient is φ = 94992.

The previous prime is 142469. The next prime is 142501. The reversal of 142491 is 194241.

142491 is digitally balanced in base 2, 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: 194241 = 3 ⋅64747.

It is not a de Polignac number, because 142491 - 2⁶ = 142427 is a prime.

It is a D-number.

It is a Duffinian number.

142491 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (142421) 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, 23746 + ... + 23751.

It is an arithmetic number, because the mean of its divisors is an integer number (47498).

2¹⁴²⁴⁹¹ is an apocalyptic number.

142491 is a deficient number, since it is larger than the sum of its proper divisors (47501).

142491 is an equidigital number, since it uses as much as digits as its factorization.

142491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47500.

The product of its digits is 288, while the sum is 21.

The square root of 142491 is about 377.4798007841. The cubic root of 142491 is about 52.2310966928.

The spelling of 142491 in words is "one hundred forty-two thousand, four hundred ninety-one".