858135389 has 2 divisors, whose sum is σ = 858135390. Its totient is φ = 858135388.

The previous prime is 858135347. The next prime is 858135409. The reversal of 858135389 is 983531858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 832784164 + 25351225 = 28858^2 + 5035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858135389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858135319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429067694 + 429067695.

It is an arithmetic number, because the mean of its divisors is an integer number (429067695).

Almost surely, 2^858135389 is an apocalyptic number.

It is an amenable number.

858135389 is a deficient number, since it is larger than the sum of its proper divisors (1).

858135389 is an equidigital number, since it uses as much as digits as its factorization.

858135389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 50.

The square root of 858135389 is about 29293.9479927169. The cubic root of 858135389 is about 950.2807624448.

The spelling of 858135389 in words is "eight hundred fifty-eight million, one hundred thirty-five thousand, three hundred eighty-nine".