42105513 has 4 divisors (see below), whose sum is σ = 56140688. Its totient is φ = 28070340.
The previous prime is 42105493. The next prime is 42105523. The reversal of 42105513 is 31550124.
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 not a de Polignac number, because 42105513 - 26 = 42105449 is a prime.
It is a super-3 number, since 3×421055133 (a number of 24 digits) contains 333 as substring.
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 42105513.
It is not an unprimeable number, because it can be changed into a prime (42105523) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7017583 + ... + 7017588.
It is an arithmetic number, because the mean of its divisors is an integer number (14035172).
Almost surely, 242105513 is an apocalyptic number.
It is an amenable number.
42105513 is a deficient number, since it is larger than the sum of its proper divisors (14035175).
42105513 is a wasteful number, since it uses less digits than its factorization.
42105513 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 14035174.
The product of its (nonzero) digits is 600, while the sum is 21.
The square root of 42105513 is about 6488.8760968291. The cubic root of 42105513 is about 347.8935051995.
Adding to 42105513 its reverse (31550124), we get a palindrome (73655637).
The spelling of 42105513 in words is "forty-two million, one hundred five thousand, five hundred thirteen".
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