42136531 has 2 divisors, whose sum is σ = 42136532. Its totient is φ = 42136530.

The previous prime is 42136513. The next prime is 42136553. The reversal of 42136531 is 13563124.

Together with previous prime (42136513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42136531 - 2¹⁷ = 42005459 is a prime.

It is a super-2 number, since 2×42136531² = 3550974489427922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42136496 and 42136505.

It is not a weakly prime, because it can be changed into another prime (42136331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21068265 + 21068266.

It is an arithmetic number, because the mean of its divisors is an integer number (21068266).

Almost surely, 2^42136531 is an apocalyptic number.

42136531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42136531 is an equidigital number, since it uses as much as digits as its factorization.

42136531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 42136531 is about 6491.2657471405. The cubic root of 42136531 is about 347.9789121630.

Adding to 42136531 its reverse (13563124), we get a palindrome (55699655).

The spelling of 42136531 in words is "forty-two million, one hundred thirty-six thousand, five hundred thirty-one".