142531231 has 4 divisors (see below), whose sum is σ = 142774632. Its totient is φ = 142287832.

The previous prime is 142531229. The next prime is 142531241. The reversal of 142531231 is 132135241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132135241 = 7 ⋅18876463.

It is a cyclic number.

It is not a de Polignac number, because 142531231 - 2¹ = 142531229 is a prime.

It is a super-2 number, since 2×142531231² = 40630303620750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142531241) 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, 120820 + ... + 121993.

It is an arithmetic number, because the mean of its divisors is an integer number (35693658).

Almost surely, 2^142531231 is an apocalyptic number.

142531231 is a deficient number, since it is larger than the sum of its proper divisors (243401).

142531231 is an equidigital number, since it uses as much as digits as its factorization.

142531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243400.

The product of its digits is 720, while the sum is 22.

The square root of 142531231 is about 11938.6444372885. The cubic root of 142531231 is about 522.3601188396.

Adding to 142531231 its reverse (132135241), we get a palindrome (274666472).

The spelling of 142531231 in words is "one hundred forty-two million, five hundred thirty-one thousand, two hundred thirty-one".