42215513 has 2 divisors, whose sum is σ = 42215514. Its totient is φ = 42215512.

The previous prime is 42215497. The next prime is 42215531. The reversal of 42215513 is 31551224.

Together with next prime (42215531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40806544 + 1408969 = 6388^2 + 1187^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215513 - 2⁴ = 42215497 is a prime.

It is not a weakly prime, because it can be changed into another prime (42215413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107756 + 21107757.

It is an arithmetic number, because the mean of its divisors is an integer number (21107757).

Almost surely, 2^42215513 is an apocalyptic number.

It is an amenable number.

42215513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215513 is an equidigital number, since it uses as much as digits as its factorization.

42215513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 23.

The square root of 42215513 is about 6497.3466122718. The cubic root of 42215513 is about 348.1961972227.

Adding to 42215513 its reverse (31551224), we get a palindrome (73766737).

The spelling of 42215513 in words is "forty-two million, two hundred fifteen thousand, five hundred thirteen".