634811 has 4 divisors (see below), whose sum is σ = 643824. Its totient is φ = 625800.

The previous prime is 634807. The next prime is 634817. The reversal of 634811 is 118436.

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 634811 - 2² = 634807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634817) 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, 4400 + ... + 4541.

It is an arithmetic number, because the mean of its divisors is an integer number (160956).

2⁶³⁴⁸¹¹ is an apocalyptic number.

634811 is a deficient number, since it is larger than the sum of its proper divisors (9013).

634811 is an equidigital number, since it uses as much as digits as its factorization.

634811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9012.

The product of its digits is 576, while the sum is 23.

The square root of 634811 is about 796.7502745528. The cubic root of 634811 is about 85.9438519382.

The spelling of 634811 in words is "six hundred thirty-four thousand, eight hundred eleven".