42251909 has 4 divisors (see below), whose sum is σ = 48287904. Its totient is φ = 36215916.

The previous prime is 42251903. The next prime is 42251917. The reversal of 42251909 is 90915224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42251909 - 2⁴ = 42251893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42251903) by changing a digit.

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, 3017987 + ... + 3018000.

It is an arithmetic number, because the mean of its divisors is an integer number (12071976).

Almost surely, 2^42251909 is an apocalyptic number.

It is an amenable number.

42251909 is a deficient number, since it is larger than the sum of its proper divisors (6035995).

42251909 is an equidigital number, since it uses as much as digits as its factorization.

42251909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035994.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 42251909 is about 6500.1468444951. The cubic root of 42251909 is about 348.2962339759.

The spelling of 42251909 in words is "forty-two million, two hundred fifty-one thousand, nine hundred nine".