1931329 has 2 divisors, whose sum is σ = 1931330. Its totient is φ = 1931328.

The previous prime is 1931323. The next prime is 1931339. The reversal of 1931329 is 9231391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1495729 + 435600 = 1223^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931329 - 2⁵ = 1931297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1931297 and 1931306.

It is not a weakly prime, because it can be changed into another prime (1931323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965664 + 965665.

It is an arithmetic number, because the mean of its divisors is an integer number (965665).

2^1931329 is an apocalyptic number.

It is an amenable number.

1931329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931329 is an equidigital number, since it uses as much as digits as its factorization.

1931329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 28.

The square root of 1931329 is about 1389.7226341972. The cubic root of 1931329 is about 124.5332782016.

The spelling of 1931329 in words is "one million, nine hundred thirty-one thousand, three hundred twenty-nine".