42187927609 has 3 divisors (see below), whose sum is σ = 42188133007. Its totient is φ = 42187722212.

The previous prime is 42187927519. The next prime is 42187927627. The reversal of 42187927609 is 90672978124.

The square root of 42187927609 is 205397.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3052010025 + 39135917584 = 55245^2 + 197828^2 .

It is not a de Polignac number, because 42187927609 - 2¹⁷ = 42187796537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42187927609.

It is not an unprimeable number, because it can be changed into a prime (42187925609) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 102699 + ... + 308095.

Almost surely, 2^42187927609 is an apocalyptic number.

42187927609 is the 205397-th square number.

42187927609 is the 102699-th centered octagonal number.

It is an amenable number.

42187927609 is a deficient number, since it is larger than the sum of its proper divisors (205398).

42187927609 is an frugal number, since it uses more digits than its factorization.

42187927609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410794 (or 205397 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 42187927609 in words is "forty-two billion, one hundred eighty-seven million, nine hundred twenty-seven thousand, six hundred nine".