142291 has 4 divisors (see below), whose sum is σ = 149800. Its totient is φ = 134784.
The previous prime is 142271. The next prime is 142297. The reversal of 142291 is 192241.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-142291 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 7489 = 142291 / (1 + 4 + 2 + 2 + 9 + 1).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (142297) 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, 3726 + ... + 3763.
It is an arithmetic number, because the mean of its divisors is an integer number (37450).
2142291 is an apocalyptic number.
142291 is a deficient number, since it is larger than the sum of its proper divisors (7509).
142291 is an equidigital number, since it uses as much as digits as its factorization.
142291 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7508.
The product of its digits is 144, while the sum is 19.
The square root of 142291 is about 377.2147929231. The cubic root of 142291 is about 52.2066481064.
The spelling of 142291 in words is "one hundred forty-two thousand, two hundred ninety-one".
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