42010831 has 4 divisors (see below), whose sum is σ = 42170832. Its totient is φ = 41850832.

The previous prime is 42010819. The next prime is 42010861. The reversal of 42010831 is 13801024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42010831 is a prime.

It is a super-2 number, since 2×42010831² = 3529819842621122, 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 = 42010799 and 42010808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42010861) 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, 79606 + ... + 80131.

It is an arithmetic number, because the mean of its divisors is an integer number (10542708).

Almost surely, 2^42010831 is an apocalyptic number.

42010831 is a deficient number, since it is larger than the sum of its proper divisors (160001).

42010831 is a wasteful number, since it uses less digits than its factorization.

42010831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160000.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 42010831 is about 6481.5762743333. The cubic root of 42010831 is about 347.6325419559.

Adding to 42010831 its reverse (13801024), we get a palindrome (55811855).

The spelling of 42010831 in words is "forty-two million, ten thousand, eight hundred thirty-one".