42985281 has 4 divisors (see below), whose sum is σ = 57313712. Its totient is φ = 28656852.

The previous prime is 42985253. The next prime is 42985291. The reversal of 42985281 is 18258924.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42985281 - 2¹⁰ = 42984257 is a prime.

It is a super-2 number, since 2×42985281² = 3695468765297922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42985211) 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, 7164211 + ... + 7164216.

It is an arithmetic number, because the mean of its divisors is an integer number (14328428).

Almost surely, 2^42985281 is an apocalyptic number.

It is an amenable number.

42985281 is a deficient number, since it is larger than the sum of its proper divisors (14328431).

42985281 is a wasteful number, since it uses less digits than its factorization.

42985281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14328430.

The product of its digits is 46080, while the sum is 39.

The square root of 42985281 is about 6556.3161150146. The cubic root of 42985281 is about 350.2998274333.

The spelling of 42985281 in words is "forty-two million, nine hundred eighty-five thousand, two hundred eighty-one".