1921501339 has 2 divisors, whose sum is σ = 1921501340. Its totient is φ = 1921501338.

The previous prime is 1921501333. The next prime is 1921501349. The reversal of 1921501339 is 9331051291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921501339 - 2⁹ = 1921500827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921501333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960750669 + 960750670.

It is an arithmetic number, because the mean of its divisors is an integer number (960750670).

Almost surely, 2^1921501339 is an apocalyptic number.

1921501339 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921501339 is an equidigital number, since it uses as much as digits as its factorization.

1921501339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 1921501339 is about 43834.9328618170. The cubic root of 1921501339 is about 1243.2168769607.

The spelling of 1921501339 in words is "one billion, nine hundred twenty-one million, five hundred one thousand, three hundred thirty-nine".