1230891321 has 16 divisors (see below), whose sum is σ = 1838778048. Its totient is φ = 725832000.

The previous prime is 1230891317. The next prime is 1230891323. The reversal of 1230891321 is 1231980321.

It is not a de Polignac number, because 1230891321 - 2² = 1230891317 is a prime.

It is a super-2 number, since 2×1230891321² = 3030186888226250082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1230891323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502830 + ... + 505271.

It is an arithmetic number, because the mean of its divisors is an integer number (114923628).

Almost surely, 2^1230891321 is an apocalyptic number.

1230891321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1230891321 is a deficient number, since it is larger than the sum of its proper divisors (607886727).

1230891321 is a wasteful number, since it uses less digits than its factorization.

1230891321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008152.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1230891321 is about 35084.0607826403. The cubic root of 1230891321 is about 1071.7000142752.

The spelling of 1230891321 in words is "one billion, two hundred thirty million, eight hundred ninety-one thousand, three hundred twenty-one".