42158261 has 4 divisors (see below), whose sum is σ = 42199500. Its totient is φ = 42117024.

The previous prime is 42158251. The next prime is 42158293. The reversal of 42158261 is 16285124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17098225 + 25060036 = 4135^2 + 5006^2 .

It is a cyclic number.

It is not a de Polignac number, because 42158261 - 2¹⁴ = 42141877 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 (42158251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19046 + ... + 21143.

It is an arithmetic number, because the mean of its divisors is an integer number (10549875).

Almost surely, 2^42158261 is an apocalyptic number.

It is an amenable number.

42158261 is a deficient number, since it is larger than the sum of its proper divisors (41239).

42158261 is a wasteful number, since it uses less digits than its factorization.

42158261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41238.

The product of its digits is 3840, while the sum is 29.

The square root of 42158261 is about 6492.9393189834. The cubic root of 42158261 is about 348.0387199838.

The spelling of 42158261 in words is "forty-two million, one hundred fifty-eight thousand, two hundred sixty-one".