653971 has 4 divisors (see below), whose sum is σ = 656352. Its totient is φ = 651592.

The previous prime is 653969. The next prime is 653977. The reversal of 653971 is 179356.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 653971 - 2¹ = 653969 is a prime.

It is a Duffinian number.

653971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (653977) 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, 715 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (164088).

2⁶⁵³⁹⁷¹ is an apocalyptic number.

653971 is a deficient number, since it is larger than the sum of its proper divisors (2381).

653971 is a wasteful number, since it uses less digits than its factorization.

653971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380.

The product of its digits is 5670, while the sum is 31.

The square root of 653971 is about 808.6847346154. The cubic root of 653971 is about 86.7999543418.

The spelling of 653971 in words is "six hundred fifty-three thousand, nine hundred seventy-one".