42088681 has 2 divisors, whose sum is σ = 42088682. Its totient is φ = 42088680.

The previous prime is 42088649. The next prime is 42088687. The reversal of 42088681 is 18688024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 10784656 = 5595^2 + 3284^2 .

It is a cyclic number.

It is not a de Polignac number, because 42088681 - 2⁵ = 42088649 is a prime.

It is a super-2 number, since 2×42088681² = 3542914136639522, 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 42088681.

It is not a weakly prime, because it can be changed into another prime (42088687) 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 as a sum of consecutive naturals, namely, 21044340 + 21044341.

It is an arithmetic number, because the mean of its divisors is an integer number (21044341).

Almost surely, 2^42088681 is an apocalyptic number.

It is an amenable number.

42088681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42088681 is an equidigital number, since it uses as much as digits as its factorization.

42088681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 42088681 is about 6487.5789783247. The cubic root of 42088681 is about 347.8471413267.

The spelling of 42088681 in words is "forty-two million, eighty-eight thousand, six hundred eighty-one".