42303581 has 2 divisors, whose sum is σ = 42303582. Its totient is φ = 42303580.

The previous prime is 42303571. The next prime is 42303587. The reversal of 42303581 is 18530324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30980356 + 11323225 = 5566^2 + 3365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42303581 is a prime.

It is a super-2 number, since 2×42303581² = 3579185930847122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42303581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42303587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21151790 + 21151791.

It is an arithmetic number, because the mean of its divisors is an integer number (21151791).

Almost surely, 2^42303581 is an apocalyptic number.

It is an amenable number.

42303581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42303581 is an equidigital number, since it uses as much as digits as its factorization.

42303581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 42303581 is about 6504.1203094654. The cubic root of 42303581 is about 348.4381591721.

The spelling of 42303581 in words is "forty-two million, three hundred three thousand, five hundred eighty-one".