42116261 has 4 divisors (see below), whose sum is σ = 45945024. Its totient is φ = 38287500.

The previous prime is 42116257. The next prime is 42116281. The reversal of 42116261 is 16261124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42116261 - 2² = 42116257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42116251) 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, 1914365 + ... + 1914386.

It is an arithmetic number, because the mean of its divisors is an integer number (11486256).

Almost surely, 2^42116261 is an apocalyptic number.

It is an amenable number.

42116261 is a deficient number, since it is larger than the sum of its proper divisors (3828763).

42116261 is a wasteful number, since it uses less digits than its factorization.

42116261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3828762.

The product of its digits is 576, while the sum is 23.

The square root of 42116261 is about 6489.7042305486. The cubic root of 42116261 is about 347.9231041841.

Adding to 42116261 its reverse (16261124), we get a palindrome (58377385).

The spelling of 42116261 in words is "forty-two million, one hundred sixteen thousand, two hundred sixty-one".