1891305379 has 2 divisors, whose sum is σ = 1891305380. Its totient is φ = 1891305378.

The previous prime is 1891305347. The next prime is 1891305401. The reversal of 1891305379 is 9735031981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1891305379 - 2⁵ = 1891305347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1891305329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945652689 + 945652690.

It is an arithmetic number, because the mean of its divisors is an integer number (945652690).

Almost surely, 2^1891305379 is an apocalyptic number.

1891305379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891305379 is an equidigital number, since it uses as much as digits as its factorization.

1891305379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1891305379 is about 43489.1409319614. The cubic root of 1891305379 is about 1236.6701720157.

The spelling of 1891305379 in words is "one billion, eight hundred ninety-one million, three hundred five thousand, three hundred seventy-nine".