42351581 has 2 divisors, whose sum is σ = 42351582. Its totient is φ = 42351580.

The previous prime is 42351577. The next prime is 42351583. The reversal of 42351581 is 18515324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 16687225 = 5066^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 42351581 - 2² = 42351577 is a prime.

It is a super-2 number, since 2×42351581² = 3587312826399122, which contains 22 as substring.

Together with 42351583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42351583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21175790 + 21175791.

It is an arithmetic number, because the mean of its divisors is an integer number (21175791).

Almost surely, 2^42351581 is an apocalyptic number.

It is an amenable number.

42351581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42351581 is an equidigital number, since it uses as much as digits as its factorization.

42351581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 42351581 is about 6507.8092319920. The cubic root of 42351581 is about 348.5698951427.

The spelling of 42351581 in words is "forty-two million, three hundred fifty-one thousand, five hundred eighty-one".