1021616 has 20 divisors (see below), whose sum is σ = 2011032. Its totient is φ = 502656.

The previous prime is 1021577. The next prime is 1021621. The reversal of 1021616 is 6161201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1021594 and 1021603.

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 in 3 ways as a sum of consecutive naturals, for example, 596 + ... + 1548.

2^1021616 is an apocalyptic number.

1021616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1021616 is a deficient number, since it is larger than the sum of its proper divisors (989416).

1021616 is an equidigital number, since it uses as much as digits as its factorization.

1021616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1021616 is about 1010.7502164234. The cubic root of 1021616 is about 100.7154031124.

Adding to 1021616 its reverse (6161201), we get a palindrome (7182817).

The spelling of 1021616 in words is "one million, twenty-one thousand, six hundred sixteen".