1321641028 has 6 divisors (see below), whose sum is σ = 2312871806. Its totient is φ = 660820512.

The previous prime is 1321641017. The next prime is 1321641029. The reversal of 1321641028 is 8201461231.

It can be written as a sum of positive squares in only one way, i.e., 819791424 + 501849604 = 28632^2 + 22402^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1321640987 and 1321641005.

It is not an unprimeable number, because it can be changed into a prime (1321641029) 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 as a sum of consecutive naturals, namely, 165205125 + ... + 165205132.

Almost surely, 2^1321641028 is an apocalyptic number.

It is an amenable number.

1321641028 is a deficient number, since it is larger than the sum of its proper divisors (991230778).

1321641028 is a wasteful number, since it uses less digits than its factorization.

1321641028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330410261 (or 330410259 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1321641028 is about 36354.3811390044. The cubic root of 1321641028 is about 1097.4157041124.

The spelling of 1321641028 in words is "one billion, three hundred twenty-one million, six hundred forty-one thousand, twenty-eight".