856883381 has 2 divisors, whose sum is σ = 856883382. Its totient is φ = 856883380.

The previous prime is 856883371. The next prime is 856883389. The reversal of 856883381 is 183388658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503104900 + 353778481 = 22430^2 + 18809^2 .

It is a cyclic number.

It is not a de Polignac number, because 856883381 - 2¹⁰ = 856882357 is a prime.

It is a super-2 number, since 2×856883381² = 1468498257267982322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856883389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428441690 + 428441691.

It is an arithmetic number, because the mean of its divisors is an integer number (428441691).

Almost surely, 2^856883381 is an apocalyptic number.

It is an amenable number.

856883381 is a deficient number, since it is larger than the sum of its proper divisors (1).

856883381 is an equidigital number, since it uses as much as digits as its factorization.

856883381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 50.

The square root of 856883381 is about 29272.5704542666. The cubic root of 856883381 is about 949.8183885523.

The spelling of 856883381 in words is "eight hundred fifty-six million, eight hundred eighty-three thousand, three hundred eighty-one".