42171051 has 16 divisors (see below), whose sum is σ = 63741440. Its totient is φ = 24585120.

The previous prime is 42171049. The next prime is 42171053. The reversal of 42171051 is 15017124.

42171051 = 284² + 285² + ... + 530².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42171049) and next prime (42171053).

It is not a de Polignac number, because 42171051 - 2¹ = 42171049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42171053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27715 + ... + 29196.

It is an arithmetic number, because the mean of its divisors is an integer number (3983840).

Almost surely, 2^42171051 is an apocalyptic number.

42171051 is a deficient number, since it is larger than the sum of its proper divisors (21570389).

42171051 is a wasteful number, since it uses less digits than its factorization.

42171051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56946.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 42171051 is about 6493.9241603209. The cubic root of 42171051 is about 348.0739124944.

Adding to 42171051 its reverse (15017124), we get a palindrome (57188175).

The spelling of 42171051 in words is "forty-two million, one hundred seventy-one thousand, fifty-one".