1891101041 has 2 divisors, whose sum is σ = 1891101042. Its totient is φ = 1891101040.

The previous prime is 1891101013. The next prime is 1891101083. The reversal of 1891101041 is 1401011981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1480633441 + 410467600 = 38479^2 + 20260^2 .

It is an emirp because it is prime and its reverse (1401011981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1891101041 - 2³⁰ = 817359217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1891101041.

It is not a weakly prime, because it can be changed into another prime (1891101001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945550520 + 945550521.

It is an arithmetic number, because the mean of its divisors is an integer number (945550521).

Almost surely, 2^1891101041 is an apocalyptic number.

It is an amenable number.

1891101041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891101041 is an equidigital number, since it uses as much as digits as its factorization.

1891101041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The square root of 1891101041 is about 43486.7915693950. The cubic root of 1891101041 is about 1236.6256334986.

The spelling of 1891101041 in words is "one billion, eight hundred ninety-one million, one hundred one thousand, forty-one".