42651265 has 4 divisors (see below), whose sum is σ = 51181524. Its totient is φ = 34121008.

The previous prime is 42651253. The next prime is 42651281. The reversal of 42651265 is 56215624.

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 14167696 + 28483569 = 3764^2 + 5337^2 .

It is a cyclic number.

It is not a de Polignac number, because 42651265 - 2⁵ = 42651233 is a prime.

It is a super-2 number, since 2×42651265² = 3638260812200450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4265122 + ... + 4265131.

It is an arithmetic number, because the mean of its divisors is an integer number (12795381).

Almost surely, 2^42651265 is an apocalyptic number.

It is an amenable number.

42651265 is a deficient number, since it is larger than the sum of its proper divisors (8530259).

42651265 is an equidigital number, since it uses as much as digits as its factorization.

42651265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8530258.

The product of its digits is 14400, while the sum is 31.

The square root of 42651265 is about 6530.7935964935. The cubic root of 42651265 is about 349.3901352246.

Adding to 42651265 its reverse (56215624), we get a palindrome (98866889).

The spelling of 42651265 in words is "forty-two million, six hundred fifty-one thousand, two hundred sixty-five".