42149321809 has 27 divisors (see below), whose sum is σ = 49621288041. Its totient is φ = 35698085640.

The previous prime is 42149321791. The next prime is 42149321813. The reversal of 42149321809 is 90812394124.

The square root of 42149321809 is 205303.

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

It is not a de Polignac number, because 42149321809 - 2⁷ = 42149321681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42149321509) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 199759714 + ... + 199759924.

It is an arithmetic number, because the mean of its divisors is an integer number (1837825483).

Almost surely, 2^42149321809 is an apocalyptic number.

42149321809 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

42149321809 is the 205303-rd square number.

42149321809 is the 102652-nd centered octagonal number.

It is an amenable number.

42149321809 is a deficient number, since it is larger than the sum of its proper divisors (7471966232).

42149321809 is an frugal number, since it uses more digits than its factorization.

42149321809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 42149321809 in words is "forty-two billion, one hundred forty-nine million, three hundred twenty-one thousand, eight hundred nine".