635381 has 4 divisors (see below), whose sum is σ = 640512. Its totient is φ = 630252.

The previous prime is 635363. The next prime is 635387. The reversal of 635381 is 183536.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 635381 - 2⁶ = 635317 is a prime.

It is a super-2 number, since 2×635381² = 807418030322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 635381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635387) 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, 2375 + ... + 2628.

It is an arithmetic number, because the mean of its divisors is an integer number (160128).

2⁶³⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

635381 is a deficient number, since it is larger than the sum of its proper divisors (5131).

635381 is a wasteful number, since it uses less digits than its factorization.

635381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130.

The product of its digits is 2160, while the sum is 26.

The square root of 635381 is about 797.1078973389. The cubic root of 635381 is about 85.9695673825.

The spelling of 635381 in words is "six hundred thirty-five thousand, three hundred eighty-one".