1891295893 has 2 divisors, whose sum is σ = 1891295894. Its totient is φ = 1891295892.

The previous prime is 1891295873. The next prime is 1891295909. The reversal of 1891295893 is 3985921981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1885035889 + 6260004 = 43417^2 + 2502^2 .

It is a cyclic number.

It is not a de Polignac number, because 1891295893 - 2²⁵ = 1857741461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891295843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945647946 + 945647947.

It is an arithmetic number, because the mean of its divisors is an integer number (945647947).

Almost surely, 2^1891295893 is an apocalyptic number.

It is an amenable number.

1891295893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891295893 is an equidigital number, since it uses as much as digits as its factorization.

1891295893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 55.

The square root of 1891295893 is about 43489.0318701164. The cubic root of 1891295893 is about 1236.6681044714.

The spelling of 1891295893 in words is "one billion, eight hundred ninety-one million, two hundred ninety-five thousand, eight hundred ninety-three".