42305251 has 4 divisors (see below), whose sum is σ = 42322672. Its totient is φ = 42287832.

The previous prime is 42305243. The next prime is 42305261. The reversal of 42305251 is 15250324.

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

It is a cyclic number.

It is not a de Polignac number, because 42305251 - 2³ = 42305243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42305261) 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, 4335 + ... + 10168.

It is an arithmetic number, because the mean of its divisors is an integer number (10580668).

Almost surely, 2^42305251 is an apocalyptic number.

42305251 is a deficient number, since it is larger than the sum of its proper divisors (17421).

42305251 is a wasteful number, since it uses less digits than its factorization.

42305251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17420.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 42305251 is about 6504.2486883575. The cubic root of 42305251 is about 348.4427441588.

Adding to 42305251 its reverse (15250324), we get a palindrome (57555575).

The spelling of 42305251 in words is "forty-two million, three hundred five thousand, two hundred fifty-one".