42172569 has 10 divisors (see below), whose sum is σ = 62998650. Its totient is φ = 28114992.

The previous prime is 42172541. The next prime is 42172591. The reversal of 42172569 is 96527124.

42172569 is a `hidden beast` number, since 4 + 21 + 72 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26132544 + 16040025 = 5112^2 + 4005^2 .

It is not a de Polignac number, because 42172569 - 2¹³ = 42164377 is a prime.

It is a super-2 number, since 2×42172569² = 3557051152119522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42172519) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 260244 + ... + 260405.

It is an arithmetic number, because the mean of its divisors is an integer number (6299865).

Almost surely, 2^42172569 is an apocalyptic number.

It is an amenable number.

42172569 is a deficient number, since it is larger than the sum of its proper divisors (20826081).

42172569 is an equidigital number, since it uses as much as digits as its factorization.

42172569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520661 (or 520652 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 42172569 is about 6494.0410377515. The cubic root of 42172569 is about 348.0780888970.

It can be divided in two parts, 4217 and 2569, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 42172569 in words is "forty-two million, one hundred seventy-two thousand, five hundred sixty-nine".