42343531 has 4 divisors (see below), whose sum is σ = 42975592. Its totient is φ = 41711472.

The previous prime is 42343517. The next prime is 42343541. The reversal of 42343531 is 13534324.

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 42343531 - 2⁹ = 42343019 is a prime.

It is a super-2 number, since 2×42343531² = 3585949235095922, 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 = 42343496 and 42343505.

It is not an unprimeable number, because it can be changed into a prime (42343501) 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, 315930 + ... + 316063.

It is an arithmetic number, because the mean of its divisors is an integer number (10743898).

Almost surely, 2^42343531 is an apocalyptic number.

42343531 is a deficient number, since it is larger than the sum of its proper divisors (632061).

42343531 is an equidigital number, since it uses as much as digits as its factorization.

42343531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632060.

The product of its digits is 4320, while the sum is 25.

The square root of 42343531 is about 6507.1907148938. The cubic root of 42343531 is about 348.5478088719.

Adding to 42343531 its reverse (13534324), we get a palindrome (55877855).

The spelling of 42343531 in words is "forty-two million, three hundred forty-three thousand, five hundred thirty-one".