42136513 has 2 divisors, whose sum is σ = 42136514. Its totient is φ = 42136512.

The previous prime is 42136447. The next prime is 42136531. The reversal of 42136513 is 31563124.

Together with next prime (42136531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39727809 + 2408704 = 6303^2 + 1552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42136513 is a prime.

It is not a weakly prime, because it can be changed into another prime (42136553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21068256 + 21068257.

It is an arithmetic number, because the mean of its divisors is an integer number (21068257).

Almost surely, 2^42136513 is an apocalyptic number.

It is an amenable number.

42136513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42136513 is an equidigital number, since it uses as much as digits as its factorization.

42136513 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 42136513 is about 6491.2643606620. The cubic root of 42136513 is about 347.9788626127.

Adding to 42136513 its reverse (31563124), we get a palindrome (73699637).

It can be divided in two parts, 421365 and 13, that multiplied together give a palindrome (5477745).

The spelling of 42136513 in words is "forty-two million, one hundred thirty-six thousand, five hundred thirteen".