899668139 has 2 divisors, whose sum is σ = 899668140. Its totient is φ = 899668138.

The previous prime is 899668129. The next prime is 899668153. The reversal of 899668139 is 931866998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 899668139 - 2¹⁶ = 899602603 is a prime.

It is not a weakly prime, because it can be changed into another prime (899668129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449834069 + 449834070.

It is an arithmetic number, because the mean of its divisors is an integer number (449834070).

Almost surely, 2^899668139 is an apocalyptic number.

899668139 is a deficient number, since it is larger than the sum of its proper divisors (1).

899668139 is an equidigital number, since it uses as much as digits as its factorization.

899668139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 59.

The square root of 899668139 is about 29994.4684733702. The cubic root of 899668139 is about 965.3707002862.

The spelling of 899668139 in words is "eight hundred ninety-nine million, six hundred sixty-eight thousand, one hundred thirty-nine".