42871289 has 2 divisors, whose sum is σ = 42871290. Its totient is φ = 42871288.

The previous prime is 42871261. The next prime is 42871307. The reversal of 42871289 is 98217824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30162064 + 12709225 = 5492^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 42871289 - 2¹⁶ = 42805753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42871489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21435644 + 21435645.

It is an arithmetic number, because the mean of its divisors is an integer number (21435645).

Almost surely, 2^42871289 is an apocalyptic number.

It is an amenable number.

42871289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42871289 is an equidigital number, since it uses as much as digits as its factorization.

42871289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 42871289 is about 6547.6170474456. The cubic root of 42871289 is about 349.9899017495.

It can be divided in two parts, 428 and 71289, that added together give a palindrome (71717).

The spelling of 42871289 in words is "forty-two million, eight hundred seventy-one thousand, two hundred eighty-nine".