42109999 has 2 divisors, whose sum is σ = 42110000. Its totient is φ = 42109998.

The previous prime is 42109981. The next prime is 42110017. The reversal of 42109999 is 99990124.

It is a balanced prime because it is at equal distance from previous prime (42109981) and next prime (42110017).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42109999 is a prime.

42109999 is a modest number, since divided by 9999 gives 4210 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42109939) 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, 21054999 + 21055000.

It is an arithmetic number, because the mean of its divisors is an integer number (21055000).

Almost surely, 2^42109999 is an apocalyptic number.

42109999 is a deficient number, since it is larger than the sum of its proper divisors (1).

42109999 is an equidigital number, since it uses as much as digits as its factorization.

42109999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 42109999 is about 6489.2217561122. The cubic root of 42109999 is about 347.9058598354.

The spelling of 42109999 in words is "forty-two million, one hundred nine thousand, nine hundred ninety-nine".