635231 has 4 divisors (see below), whose sum is σ = 636864. Its totient is φ = 633600.

The previous prime is 635207. The next prime is 635249. The reversal of 635231 is 132536.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 635231 - 2¹⁴ = 618847 is a prime.

It is a super-2 number, since 2×635231² = 807036846722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635251) 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, 146 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (159216).

2⁶³⁵²³¹ is an apocalyptic number.

635231 is a deficient number, since it is larger than the sum of its proper divisors (1633).

635231 is an equidigital number, since it uses as much as digits as its factorization.

635231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632.

The product of its digits is 540, while the sum is 20.

The square root of 635231 is about 797.0138016371. The cubic root of 635231 is about 85.9628016519.

Adding to 635231 its reverse (132536), we get a palindrome (767767).

The spelling of 635231 in words is "six hundred thirty-five thousand, two hundred thirty-one".