634491 has 48 divisors (see below), whose sum is σ = 1179360. Its totient is φ = 322560.

The previous prime is 634483. The next prime is 634493. The reversal of 634491 is 194436.

It is not a de Polignac number, because 634491 - 2³ = 634483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21865 + ... + 21893.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2⁶³⁴⁴⁹¹ is an apocalyptic number.

634491 is a deficient number, since it is larger than the sum of its proper divisors (544869).

634491 is a wasteful number, since it uses less digits than its factorization.

634491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 73 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 634491 is about 796.5494334942. The cubic root of 634491 is about 85.9294084503.

It can be divided in two parts, 63 and 4491, that added together give a palindrome (4554).

The spelling of 634491 in words is "six hundred thirty-four thousand, four hundred ninety-one".