42505313 has 4 divisors (see below), whose sum is σ = 42895380. Its totient is φ = 42115248.

The previous prime is 42505277. The next prime is 42505327. The reversal of 42505313 is 31350524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10163344 + 32341969 = 3188^2 + 5687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42505313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42505363) 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, 194870 + ... + 195087.

It is an arithmetic number, because the mean of its divisors is an integer number (10723845).

Almost surely, 2^42505313 is an apocalyptic number.

It is an amenable number.

42505313 is a deficient number, since it is larger than the sum of its proper divisors (390067).

42505313 is a wasteful number, since it uses less digits than its factorization.

42505313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390066.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 42505313 is about 6519.6098809668. The cubic root of 42505313 is about 348.9911437998.

Adding to 42505313 its reverse (31350524), we get a palindrome (73855837).

The spelling of 42505313 in words is "forty-two million, five hundred five thousand, three hundred thirteen".