2856917381 has 2 divisors, whose sum is σ = 2856917382. Its totient is φ = 2856917380.

The previous prime is 2856917363. The next prime is 2856917417. The reversal of 2856917381 is 1837196582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2581656100 + 275261281 = 50810^2 + 16591^2 .

It is a cyclic number.

It is not a de Polignac number, because 2856917381 - 2⁶ = 2856917317 is a prime.

It is a super-2 number, since 2×2856917381² = 16323953843719798322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2856917341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428458690 + 1428458691.

It is an arithmetic number, because the mean of its divisors is an integer number (1428458691).

Almost surely, 2^2856917381 is an apocalyptic number.

It is an amenable number.

2856917381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856917381 is an equidigital number, since it uses as much as digits as its factorization.

2856917381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The square root of 2856917381 is about 53450.1392046831. The cubic root of 2856917381 is about 1418.9460838493.

The spelling of 2856917381 in words is "two billion, eight hundred fifty-six million, nine hundred seventeen thousand, three hundred eighty-one".