42542131 has 2 divisors, whose sum is σ = 42542132. Its totient is φ = 42542130.

The previous prime is 42542113. The next prime is 42542141. The reversal of 42542131 is 13124524.

Together with previous prime (42542113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42542131 - 2⁵ = 42542099 is a prime.

It is a super-2 number, since 2×42542131² = 3619665820042322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42542141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21271065 + 21271066.

It is an arithmetic number, because the mean of its divisors is an integer number (21271066).

Almost surely, 2^42542131 is an apocalyptic number.

42542131 is a deficient number, since it is larger than the sum of its proper divisors (1).

42542131 is an equidigital number, since it uses as much as digits as its factorization.

42542131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 42542131 is about 6522.4329049826. The cubic root of 42542131 is about 349.0918798164.

Adding to 42542131 its reverse (13124524), we get a palindrome (55666655).

The spelling of 42542131 in words is "forty-two million, five hundred forty-two thousand, one hundred thirty-one".