42071831 has 4 divisors (see below), whose sum is σ = 42664464. Its totient is φ = 41479200.

The previous prime is 42071819. The next prime is 42071839. The reversal of 42071831 is 13817024.

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 42071831 - 2¹⁸ = 41809687 is a prime.

It is a super-2 number, since 2×42071831² = 3540077927385122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42071831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42071839) 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, 296210 + ... + 296351.

It is an arithmetic number, because the mean of its divisors is an integer number (10666116).

Almost surely, 2^42071831 is an apocalyptic number.

42071831 is a deficient number, since it is larger than the sum of its proper divisors (592633).

42071831 is an equidigital number, since it uses as much as digits as its factorization.

42071831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592632.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42071831 is about 6486.2802128801. The cubic root of 42071831 is about 347.8007154902.

Adding to 42071831 its reverse (13817024), we get a palindrome (55888855).

The spelling of 42071831 in words is "forty-two million, seventy-one thousand, eight hundred thirty-one".