42172031 has 8 divisors (see below), whose sum is σ = 46085328. Its totient is φ = 38272000.

The previous prime is 42172007. The next prime is 42172033. The reversal of 42172031 is 13027124.

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

It is a cyclic number.

It is not a de Polignac number, because 42172031 - 2²² = 37977727 is a prime.

It is a super-2 number, since 2×42172031² = 3556960397329922, 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 = 42171994 and 42172012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4061 + ... + 10041.

It is an arithmetic number, because the mean of its divisors is an integer number (5760666).

Almost surely, 2^42172031 is an apocalyptic number.

42172031 is a deficient number, since it is larger than the sum of its proper divisors (3913297).

42172031 is a wasteful number, since it uses less digits than its factorization.

42172031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 42172031 is about 6493.9996150292. Note that the first 3 decimals coincide. The cubic root of 42172031 is about 348.0766087341.

Adding to 42172031 its reverse (13027124), we get a palindrome (55199155).

The spelling of 42172031 in words is "forty-two million, one hundred seventy-two thousand, thirty-one".