891891053 has 2 divisors, whose sum is σ = 891891054. Its totient is φ = 891891052.

The previous prime is 891891037. The next prime is 891891059. The reversal of 891891053 is 350198198.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667550569 + 224340484 = 25837^2 + 14978^2 .

It is a cyclic number.

It is not a de Polignac number, because 891891053 - 2⁴ = 891891037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 891890995 and 891891013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891891059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445945526 + 445945527.

It is an arithmetic number, because the mean of its divisors is an integer number (445945527).

Almost surely, 2^891891053 is an apocalyptic number.

It is an amenable number.

891891053 is a deficient number, since it is larger than the sum of its proper divisors (1).

891891053 is an equidigital number, since it uses as much as digits as its factorization.

891891053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 891891053 is about 29864.5450827566. The cubic root of 891891053 is about 962.5809646402.

The spelling of 891891053 in words is "eight hundred ninety-one million, eight hundred ninety-one thousand, fifty-three".