891897983 has 2 divisors, whose sum is σ = 891897984. Its totient is φ = 891897982.

The previous prime is 891897967. The next prime is 891898001. The reversal of 891897983 is 389798198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891897983 - 2⁴ = 891897967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891897883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445948991 + 445948992.

It is an arithmetic number, because the mean of its divisors is an integer number (445948992).

Almost surely, 2^891897983 is an apocalyptic number.

891897983 is a deficient number, since it is larger than the sum of its proper divisors (1).

891897983 is an equidigital number, since it uses as much as digits as its factorization.

891897983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 891897983 is about 29864.6611063980. The cubic root of 891897983 is about 962.5834577208.

The spelling of 891897983 in words is "eight hundred ninety-one million, eight hundred ninety-seven thousand, nine hundred eighty-three".