42315231 has 8 divisors (see below), whose sum is σ = 64480384. Its totient is φ = 24180120.

The previous prime is 42315211. The next prime is 42315241. The reversal of 42315231 is 13251324.

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

It is not a de Polignac number, because 42315231 - 2⁷ = 42315103 is a prime.

It is a super-2 number, since 2×42315231² = 3581157549166722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2015011 = 42315231 / (4 + 2 + 3 + 1 + 5 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42315198 and 42315207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42315211) 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, 1007485 + ... + 1007526.

It is an arithmetic number, because the mean of its divisors is an integer number (8060048).

Almost surely, 2^42315231 is an apocalyptic number.

42315231 is a deficient number, since it is larger than the sum of its proper divisors (22165153).

42315231 is a wasteful number, since it uses less digits than its factorization.

42315231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015021.

The product of its digits is 720, while the sum is 21.

The square root of 42315231 is about 6505.0158339546. The cubic root of 42315231 is about 348.4701417442.

Adding to 42315231 its reverse (13251324), we get a palindrome (55566555).

The spelling of 42315231 in words is "forty-two million, three hundred fifteen thousand, two hundred thirty-one".