142531 has 4 divisors (see below), whose sum is σ = 148752. Its totient is φ = 136312.

The previous prime is 142529. The next prime is 142537. The reversal of 142531 is 135241.

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

It is a cyclic number.

It is not a de Polignac number, because 142531 - 2¹ = 142529 is a prime.

It is a super-2 number, since 2×142531² = 40630171922, which contains 22 as substring.

It is a Duffinian number.

142531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (142537) 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, 3076 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (37188).

2¹⁴²⁵³¹ is an apocalyptic number.

142531 is a deficient number, since it is larger than the sum of its proper divisors (6221).

142531 is an equidigital number, since it uses as much as digits as its factorization.

142531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220.

The product of its digits is 120, while the sum is 16.

The square root of 142531 is about 377.5327800337. The cubic root of 142531 is about 52.2359836644.

Adding to 142531 its reverse (135241), we get a palindrome (277772).

The spelling of 142531 in words is "one hundred forty-two thousand, five hundred thirty-one".