42551305 has 8 divisors (see below), whose sum is σ = 51215112. Its totient is φ = 33938688.

The previous prime is 42551303. The next prime is 42551351. The reversal of 42551305 is 50315524.

It can be written as a sum of positive squares in 4 ways, for example, as 9339136 + 33212169 = 3056^2 + 5763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42551305 - 2¹ = 42551303 is a prime.

It is a super-2 number, since 2×42551305² = 3621227114406050, which contains 22 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 42551305.

It is not an unprimeable number, because it can be changed into a prime (42551303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10942 + ... + 14311.

It is an arithmetic number, because the mean of its divisors is an integer number (6401889).

Almost surely, 2^42551305 is an apocalyptic number.

It is an amenable number.

42551305 is a deficient number, since it is larger than the sum of its proper divisors (8663807).

42551305 is a wasteful number, since it uses less digits than its factorization.

42551305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25595.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 42551305 is about 6523.1361322603. The cubic root of 42551305 is about 349.1169713249.

Adding to 42551305 its reverse (50315524), we get a palindrome (92866829).

The spelling of 42551305 in words is "forty-two million, five hundred fifty-one thousand, three hundred five".