142691 has 4 divisors (see below), whose sum is σ = 143472. Its totient is φ = 141912.

The previous prime is 142673. The next prime is 142697. The reversal of 142691 is 196241.

It is a happy number.

142691 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 196241 = 311 ⋅631.

It is a cyclic number.

It is not a de Polignac number, because 142691 - 2¹⁰ = 141667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142697) 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, 50 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (35868).

2¹⁴²⁶⁹¹ is an apocalyptic number.

142691 is a deficient number, since it is larger than the sum of its proper divisors (781).

142691 is an equidigital number, since it uses as much as digits as its factorization.

142691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 432, while the sum is 23.

The square root of 142691 is about 377.7446227281. The cubic root of 142691 is about 52.2555224126.

The spelling of 142691 in words is "one hundred forty-two thousand, six hundred ninety-one".