42851281 has 4 divisors (see below), whose sum is σ = 46746864. Its totient is φ = 38955700.

The previous prime is 42851227. The next prime is 42851293. The reversal of 42851281 is 18215824.

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 a cyclic number.

It is not a de Polignac number, because 42851281 - 2⁷ = 42851153 is a prime.

It is a super-2 number, since 2×42851281² = 3672464566681922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42851381) 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, 1947775 + ... + 1947796.

It is an arithmetic number, because the mean of its divisors is an integer number (11686716).

Almost surely, 2^42851281 is an apocalyptic number.

42851281 is the 2928-th centered decagonal number.

It is an amenable number.

42851281 is a deficient number, since it is larger than the sum of its proper divisors (3895583).

42851281 is a wasteful number, since it uses less digits than its factorization.

42851281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895582.

The product of its digits is 5120, while the sum is 31.

The square root of 42851281 is about 6546.0889850353. The cubic root of 42851281 is about 349.9354465980.

The spelling of 42851281 in words is "forty-two million, eight hundred fifty-one thousand, two hundred eighty-one".