42542261 has 4 divisors (see below), whose sum is σ = 43914624. Its totient is φ = 41169900.

The previous prime is 42542251. The next prime is 42542263. The reversal of 42542261 is 16224524.

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 42542261 - 2²² = 38347957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42542261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42542263) 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, 686135 + ... + 686196.

It is an arithmetic number, because the mean of its divisors is an integer number (10978656).

Almost surely, 2^42542261 is an apocalyptic number.

It is an amenable number.

42542261 is a deficient number, since it is larger than the sum of its proper divisors (1372363).

42542261 is a wasteful number, since it uses less digits than its factorization.

42542261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372362.

The product of its digits is 3840, while the sum is 26.

The square root of 42542261 is about 6522.4428705815. The cubic root of 42542261 is about 349.0922354004.

Adding to 42542261 its reverse (16224524), we get a palindrome (58766785).

The spelling of 42542261 in words is "forty-two million, five hundred forty-two thousand, two hundred sixty-one".