42117251 has 16 divisors (see below), whose sum is σ = 49075200. Its totient is φ = 35767200.

The previous prime is 42117239. The next prime is 42117259. The reversal of 42117251 is 15271124.

It is a cyclic number.

It is not a de Polignac number, because 42117251 - 2¹⁰ = 42116227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42117259) 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, 7760 + ... + 12018.

It is an arithmetic number, because the mean of its divisors is an integer number (3067200).

Almost surely, 2^42117251 is an apocalyptic number.

42117251 is a deficient number, since it is larger than the sum of its proper divisors (6957949).

42117251 is a wasteful number, since it uses less digits than its factorization.

42117251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330.

The product of its digits is 560, while the sum is 23.

The square root of 42117251 is about 6489.7805047629. The cubic root of 42117251 is about 347.9258302980.

Adding to 42117251 its reverse (15271124), we get a palindrome (57388375).

The spelling of 42117251 in words is "forty-two million, one hundred seventeen thousand, two hundred fifty-one".