321634 has 4 divisors (see below), whose sum is σ = 482454. Its totient is φ = 160816.

The previous prime is 321631. The next prime is 321647. The reversal of 321634 is 436123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 436123 = 149 ⋅2927.

It can be written as a sum of positive squares in only one way, i.e., 164025 + 157609 = 405^2 + 397^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (321631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80407 + ... + 80410.

2³²¹⁶³⁴ is an apocalyptic number.

321634 is a deficient number, since it is larger than the sum of its proper divisors (160820).

321634 is a wasteful number, since it uses less digits than its factorization.

321634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160819.

The product of its digits is 432, while the sum is 19.

The square root of 321634 is about 567.1278515467. The cubic root of 321634 is about 68.5152611317.

Adding to 321634 its reverse (436123), we get a palindrome (757757).

The spelling of 321634 in words is "three hundred twenty-one thousand, six hundred thirty-four".