871970909 has 2 divisors, whose sum is σ = 871970910. Its totient is φ = 871970908.

The previous prime is 871970881. The next prime is 871970921. The reversal of 871970909 is 909079178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 798062500 + 73908409 = 28250^2 + 8597^2 .

It is a cyclic number.

It is not a de Polignac number, because 871970909 - 2⁸ = 871970653 is a prime.

It is a super-2 number, since 2×871970909² = 1520666532284572562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871970959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435985454 + 435985455.

It is an arithmetic number, because the mean of its divisors is an integer number (435985455).

Almost surely, 2^871970909 is an apocalyptic number.

It is an amenable number.

871970909 is a deficient number, since it is larger than the sum of its proper divisors (1).

871970909 is an equidigital number, since it uses as much as digits as its factorization.

871970909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 871970909 is about 29529.1535435745. The cubic root of 871970909 is about 955.3606119663.

The spelling of 871970909 in words is "eight hundred seventy-one million, nine hundred seventy thousand, nine hundred nine".