662971 has 4 divisors (see below), whose sum is σ = 668952. Its totient is φ = 656992.

The previous prime is 662957. The next prime is 662999. The reversal of 662971 is 179266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179266 = 2 ⋅89633.

It is a cyclic number.

It is not a de Polignac number, because 662971 - 2⁵ = 662939 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

662971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (662941) 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, 2821 + ... + 3046.

It is an arithmetic number, because the mean of its divisors is an integer number (167238).

2⁶⁶²⁹⁷¹ is an apocalyptic number.

662971 is a deficient number, since it is larger than the sum of its proper divisors (5981).

662971 is a wasteful number, since it uses less digits than its factorization.

662971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980.

The product of its digits is 4536, while the sum is 31.

The square root of 662971 is about 814.2303113984. The cubic root of 662971 is about 87.1963241584.

The spelling of 662971 in words is "six hundred sixty-two thousand, nine hundred seventy-one".