635491 has 4 divisors (see below), whose sum is σ = 639184. Its totient is φ = 631800.

The previous prime is 635483. The next prime is 635507. The reversal of 635491 is 194536.

635491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 635491 - 2³ = 635483 is a prime.

It is a super-2 number, since 2×635491² = 807697622162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (635431) 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, 1575 + ... + 1936.

It is an arithmetic number, because the mean of its divisors is an integer number (159796).

2⁶³⁵⁴⁹¹ is an apocalyptic number.

635491 is a deficient number, since it is larger than the sum of its proper divisors (3693).

635491 is a wasteful number, since it uses less digits than its factorization.

635491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692.

The product of its digits is 3240, while the sum is 28.

The square root of 635491 is about 797.1768937946. The cubic root of 635491 is about 85.9745282415.

The spelling of 635491 in words is "six hundred thirty-five thousand, four hundred ninety-one".