42815331 has 32 divisors (see below), whose sum is σ = 68741120. Its totient is φ = 26181792.

The previous prime is 42815317. The next prime is 42815359. The reversal of 42815331 is 13351824.

It is a happy number.

It is not a de Polignac number, because 42815331 - 2⁷ = 42815203 is a prime.

It is a super-2 number, since 2×42815331² = 3666305137279122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42815295 and 42815304.

It is not an unprimeable number, because it can be changed into a prime (42810331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78000 + ... + 78546.

It is an arithmetic number, because the mean of its divisors is an integer number (2148160).

Almost surely, 2^42815331 is an apocalyptic number.

42815331 is a deficient number, since it is larger than the sum of its proper divisors (25925789).

42815331 is a wasteful number, since it uses less digits than its factorization.

42815331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 786 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 42815331 is about 6543.3424944748. The cubic root of 42815331 is about 349.8375599951.

The spelling of 42815331 in words is "forty-two million, eight hundred fifteen thousand, three hundred thirty-one".