142306531 has 4 divisors (see below), whose sum is σ = 145777464. Its totient is φ = 138835600.

The previous prime is 142306529. The next prime is 142306559. The reversal of 142306531 is 135603241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135603241 = 823 ⋅164767.

It is a cyclic number.

It is not a de Polignac number, because 142306531 - 2¹ = 142306529 is a prime.

It is a super-2 number, since 2×142306531² = 40502297530507922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142306496 and 142306505.

It is not an unprimeable number, because it can be changed into a prime (142306501) 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, 1735405 + ... + 1735486.

It is an arithmetic number, because the mean of its divisors is an integer number (36444366).

Almost surely, 2^142306531 is an apocalyptic number.

142306531 is a deficient number, since it is larger than the sum of its proper divisors (3470933).

142306531 is an equidigital number, since it uses as much as digits as its factorization.

142306531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470932.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 142306531 is about 11929.2301092736. The cubic root of 142306531 is about 522.0854748148.

Adding to 142306531 its reverse (135603241), we get a palindrome (277909772).

The spelling of 142306531 in words is "one hundred forty-two million, three hundred six thousand, five hundred thirty-one".