142231531 has 8 divisors (see below), whose sum is σ = 155330784. Its totient is φ = 129440640.

The previous prime is 142231493. The next prime is 142231561. The reversal of 142231531 is 135132241.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142231531 - 2¹³ = 142223339 is a prime.

It is a super-2 number, since 2×142231531² = 40459616821207922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142231561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76126 + ... + 77971.

It is an arithmetic number, because the mean of its divisors is an integer number (19416348).

Almost surely, 2^142231531 is an apocalyptic number.

142231531 is a deficient number, since it is larger than the sum of its proper divisors (13099253).

142231531 is a wasteful number, since it uses less digits than its factorization.

142231531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154181.

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

The square root of 142231531 is about 11926.0861559860. The cubic root of 142231531 is about 521.9937402302.

Adding to 142231531 its reverse (135132241), we get a palindrome (277363772).

The spelling of 142231531 in words is "one hundred forty-two million, two hundred thirty-one thousand, five hundred thirty-one".