42811971 has 16 divisors (see below), whose sum is σ = 58834944. Its totient is φ = 27676544.

The previous prime is 42811943. The next prime is 42811999. The reversal of 42811971 is 17911824.

It is an interprime number because it is at equal distance from previous prime (42811943) and next prime (42811999).

It is a cyclic number.

It is not a de Polignac number, because 42811971 - 2⁵ = 42811939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42811271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14590 + ... + 17276.

It is an arithmetic number, because the mean of its divisors is an integer number (3677184).

Almost surely, 2^42811971 is an apocalyptic number.

42811971 is a deficient number, since it is larger than the sum of its proper divisors (16022973).

42811971 is a wasteful number, since it uses less digits than its factorization.

42811971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its digits is 4032, while the sum is 33.

The square root of 42811971 is about 6543.0857399242. The cubic root of 42811971 is about 349.8284084060.

The spelling of 42811971 in words is "forty-two million, eight hundred eleven thousand, nine hundred seventy-one".