42771217 has 4 divisors (see below), whose sum is σ = 43171056. Its totient is φ = 42371380.

The previous prime is 42771193. The next prime is 42771221. The reversal of 42771217 is 71217724.

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 a de Polignac number, because none of the positive numbers 2^k-42771217 is a prime.

It is a super-2 number, since 2×42771217² = 3658754007322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42771247) 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, 199759 + ... + 199972.

It is an arithmetic number, because the mean of its divisors is an integer number (10792764).

Almost surely, 2^42771217 is an apocalyptic number.

It is an amenable number.

42771217 is a deficient number, since it is larger than the sum of its proper divisors (399839).

42771217 is a wasteful number, since it uses less digits than its factorization.

42771217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399838.

The product of its digits is 5488, while the sum is 31.

The square root of 42771217 is about 6539.9707185889. The cubic root of 42771217 is about 349.7173691111.

The spelling of 42771217 in words is "forty-two million, seven hundred seventy-one thousand, two hundred seventeen".