854898991 has 2 divisors, whose sum is σ = 854898992. Its totient is φ = 854898990.

The previous prime is 854898923. The next prime is 854899007. The reversal of 854898991 is 199898458.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 854898991 - 2¹⁵ = 854866223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (854898911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427449495 + 427449496.

It is an arithmetic number, because the mean of its divisors is an integer number (427449496).

Almost surely, 2^854898991 is an apocalyptic number.

854898991 is a deficient number, since it is larger than the sum of its proper divisors (1).

854898991 is an equidigital number, since it uses as much as digits as its factorization.

854898991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 61.

The square root of 854898991 is about 29238.6557659548. The cubic root of 854898991 is about 949.0846181658.

The spelling of 854898991 in words is "eight hundred fifty-four million, eight hundred ninety-eight thousand, nine hundred ninety-one".