857973971 has 2 divisors, whose sum is σ = 857973972. Its totient is φ = 857973970.

The previous prime is 857973947. The next prime is 857973979. The reversal of 857973971 is 179379758.

857973971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857973971 is a prime.

It is a super-2 number, since 2×857973971² = 1472238669827017682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857973979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428986985 + 428986986.

It is an arithmetic number, because the mean of its divisors is an integer number (428986986).

Almost surely, 2^857973971 is an apocalyptic number.

857973971 is a deficient number, since it is larger than the sum of its proper divisors (1).

857973971 is an equidigital number, since it uses as much as digits as its factorization.

857973971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3333960, while the sum is 56.

The square root of 857973971 is about 29291.1927206797. The cubic root of 857973971 is about 950.2211750957.

The spelling of 857973971 in words is "eight hundred fifty-seven million, nine hundred seventy-three thousand, nine hundred seventy-one".