42831709 has 2 divisors, whose sum is σ = 42831710. Its totient is φ = 42831708.

The previous prime is 42831703. The next prime is 42831713. The reversal of 42831709 is 90713824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34692100 + 8139609 = 5890^2 + 2853^2 .

It is a cyclic number.

It is not a de Polignac number, because 42831709 - 2⁹ = 42831197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42831703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21415854 + 21415855.

It is an arithmetic number, because the mean of its divisors is an integer number (21415855).

Almost surely, 2^42831709 is an apocalyptic number.

It is an amenable number.

42831709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42831709 is an equidigital number, since it uses as much as digits as its factorization.

42831709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 42831709 is about 6544.5938758643. The cubic root of 42831709 is about 349.8821616911.

The spelling of 42831709 in words is "forty-two million, eight hundred thirty-one thousand, seven hundred nine".