42265309 has 2 divisors, whose sum is σ = 42265310. Its totient is φ = 42265308.

The previous prime is 42265273. The next prime is 42265319. The reversal of 42265309 is 90356224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41641209 + 624100 = 6453^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42265309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42265319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21132654 + 21132655.

It is an arithmetic number, because the mean of its divisors is an integer number (21132655).

Almost surely, 2^42265309 is an apocalyptic number.

It is an amenable number.

42265309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42265309 is an equidigital number, since it uses as much as digits as its factorization.

42265309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 42265309 is about 6501.1775087287. The cubic root of 42265309 is about 348.3330502708. Note that the first 3 decimals are identical.

The spelling of 42265309 in words is "forty-two million, two hundred sixty-five thousand, three hundred nine".