42109019 has 4 divisors (see below), whose sum is σ = 42125496. Its totient is φ = 42092544.

The previous prime is 42109013. The next prime is 42109037. The reversal of 42109019 is 91090124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42109019 - 2⁴ = 42109003 is a prime.

It is a super-2 number, since 2×42109019² = 3546338962284722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42109013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3494 + ... + 9819.

It is an arithmetic number, because the mean of its divisors is an integer number (10531374).

Almost surely, 2^42109019 is an apocalyptic number.

42109019 is a deficient number, since it is larger than the sum of its proper divisors (16477).

42109019 is a wasteful number, since it uses less digits than its factorization.

42109019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16476.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 42109019 is about 6489.1462458478. The cubic root of 42109019 is about 347.9031609484.

The spelling of 42109019 in words is "forty-two million, one hundred nine thousand, nineteen".