1829891321 has 2 divisors, whose sum is σ = 1829891322. Its totient is φ = 1829891320.

The previous prime is 1829891317. The next prime is 1829891333. The reversal of 1829891321 is 1231989281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1606807225 + 223084096 = 40085^2 + 14936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1829891321 - 2² = 1829891317 is a prime.

It is a super-2 number, since 2×1829891321² = 6697004493342250082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1829891521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 914945660 + 914945661.

It is an arithmetic number, because the mean of its divisors is an integer number (914945661).

Almost surely, 2^1829891321 is an apocalyptic number.

It is an amenable number.

1829891321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1829891321 is an equidigital number, since it uses as much as digits as its factorization.

1829891321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 1829891321 is about 42777.2290009533. The cubic root of 1829891321 is about 1223.1369867463.

The spelling of 1829891321 in words is "one billion, eight hundred twenty-nine million, eight hundred ninety-one thousand, three hundred twenty-one".