1621017226 has 16 divisors (see below), whose sum is σ = 2442903624. Its totient is φ = 806723584.

The previous prime is 1621017221. The next prime is 1621017227. The reversal of 1621017226 is 6227101261.

It can be written as a sum of positive squares in 4 ways, for example, as 1620143001 + 874225 = 40251^2 + 935^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1621017194 and 1621017203.

It is not an unprimeable number, because it can be changed into a prime (1621017221) 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 7 ways as a sum of consecutive naturals, for example, 712026 + ... + 714298.

Almost surely, 2^1621017226 is an apocalyptic number.

1621017226 is a deficient number, since it is larger than the sum of its proper divisors (821886398).

1621017226 is a wasteful number, since it uses less digits than its factorization.

1621017226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1621017226 is about 40261.8582035156. The cubic root of 1621017226 is about 1174.7060622224.

Adding to 1621017226 its reverse (6227101261), we get a palindrome (7848118487).

The spelling of 1621017226 in words is "one billion, six hundred twenty-one million, seventeen thousand, two hundred twenty-six".