42320251 has 4 divisors (see below), whose sum is σ = 43779600. Its totient is φ = 40860904.

The previous prime is 42320249. The next prime is 42320269. The reversal of 42320251 is 15202324.

42320251 = 654² + 655² + ... + 740².

42320251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42320251 - 2¹ = 42320249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42320951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729631 + ... + 729688.

It is an arithmetic number, because the mean of its divisors is an integer number (10944900).

Almost surely, 2^42320251 is an apocalyptic number.

42320251 is a deficient number, since it is larger than the sum of its proper divisors (1459349).

42320251 is a wasteful number, since it uses less digits than its factorization.

42320251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459348.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42320251 is about 6505.4016786052. The cubic root of 42320251 is about 348.4839212659.

Adding to 42320251 its reverse (15202324), we get a palindrome (57522575).

The spelling of 42320251 in words is "forty-two million, three hundred twenty thousand, two hundred fifty-one".