42398516281 has 9 divisors (see below), whose sum is σ = 46605817573. Its totient is φ = 38542046620.

The previous prime is 42398516269. The next prime is 42398516291. The reversal of 42398516281 is 18261589324.

The square root of 42398516281 is 205909.

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

It is not a de Polignac number, because 42398516281 - 2¹⁵ = 42398483513 is a prime.

It is a super-2 number, since 2×42398516281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42398516231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2255640 + ... + 2274358.

Almost surely, 2^42398516281 is an apocalyptic number.

42398516281 is the 205909-th square number.

42398516281 is the 102955-th centered octagonal number.

It is an amenable number.

42398516281 is a deficient number, since it is larger than the sum of its proper divisors (4207301292).

42398516281 is an frugal number, since it uses more digits than its factorization.

42398516281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37460 (or 18730 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

Multiplying 42398516281 by its sum of digits (49), we get a square (2077527297769 = 1441363²).

The spelling of 42398516281 in words is "forty-two billion, three hundred ninety-eight million, five hundred sixteen thousand, two hundred eighty-one".