858946391 has 2 divisors, whose sum is σ = 858946392. Its totient is φ = 858946390.

The previous prime is 858946327. The next prime is 858946393. The reversal of 858946391 is 193649858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 858946391 - 2⁶ = 858946327 is a prime.

It is a super-2 number, since 2×858946391² = 1475577805223849762, which contains 22 as substring.

Together with 858946393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858946393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429473195 + 429473196.

It is an arithmetic number, because the mean of its divisors is an integer number (429473196).

Almost surely, 2^858946391 is an apocalyptic number.

858946391 is a deficient number, since it is larger than the sum of its proper divisors (1).

858946391 is an equidigital number, since it uses as much as digits as its factorization.

858946391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 858946391 is about 29307.7872074983. The cubic root of 858946391 is about 950.5800302732.

The spelling of 858946391 in words is "eight hundred fifty-eight million, nine hundred forty-six thousand, three hundred ninety-one".