635971 has 6 divisors (see below), whose sum is σ = 739860. Its totient is φ = 545076.

The previous prime is 635969. The next prime is 635977. The reversal of 635971 is 179536.

It is not a de Polignac number, because 635971 - 2¹ = 635969 is a prime.

It is a super-2 number, since 2×635971² = 808918225682, which contains 22 as substring.

It is a Duffinian number.

635971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (635977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6441 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (123310).

2⁶³⁵⁹⁷¹ is an apocalyptic number.

635971 is a deficient number, since it is larger than the sum of its proper divisors (103889).

635971 is a wasteful number, since it uses less digits than its factorization.

635971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993 (or 12986 counting only the distinct ones).

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

The square root of 635971 is about 797.4778993803. The cubic root of 635971 is about 85.9961689298.

The spelling of 635971 in words is "six hundred thirty-five thousand, nine hundred seventy-one".