1021634 has 4 divisors (see below), whose sum is σ = 1532454. Its totient is φ = 510816.

The previous prime is 1021627. The next prime is 1021651. The reversal of 1021634 is 4361201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4361201 = 13 ⋅335477.

It can be written as a sum of positive squares in only one way, i.e., 1006009 + 15625 = 1003^2 + 125^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255407 + ... + 255410.

2^1021634 is an apocalyptic number.

1021634 is a deficient number, since it is larger than the sum of its proper divisors (510820).

1021634 is an equidigital number, since it uses as much as digits as its factorization.

1021634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510819.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1021634 is about 1010.7591206613. The cubic root of 1021634 is about 100.7159946153.

Adding to 1021634 its reverse (4361201), we get a palindrome (5382835).

The spelling of 1021634 in words is "one million, twenty-one thousand, six hundred thirty-four".