899856491 has 2 divisors, whose sum is σ = 899856492. Its totient is φ = 899856490.

The previous prime is 899856467. The next prime is 899856497. The reversal of 899856491 is 194658998.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 899856491 - 2¹⁸ = 899594347 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 899856491.

It is not a weakly prime, because it can be changed into another prime (899856497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449928245 + 449928246.

It is an arithmetic number, because the mean of its divisors is an integer number (449928246).

Almost surely, 2^899856491 is an apocalyptic number.

899856491 is a deficient number, since it is larger than the sum of its proper divisors (1).

899856491 is an equidigital number, since it uses as much as digits as its factorization.

899856491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 59.

The square root of 899856491 is about 29997.6080879793. The cubic root of 899856491 is about 965.4380646867.

The spelling of 899856491 in words is "eight hundred ninety-nine million, eight hundred fifty-six thousand, four hundred ninety-one".