861741971 has 2 divisors, whose sum is σ = 861741972. Its totient is φ = 861741970.

The previous prime is 861741949. The next prime is 861741983. The reversal of 861741971 is 179147168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861741971 - 2¹⁴ = 861725587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (861746971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430870985 + 430870986.

It is an arithmetic number, because the mean of its divisors is an integer number (430870986).

Almost surely, 2^861741971 is an apocalyptic number.

861741971 is a deficient number, since it is larger than the sum of its proper divisors (1).

861741971 is an equidigital number, since it uses as much as digits as its factorization.

861741971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 861741971 is about 29355.4419316078. The cubic root of 861741971 is about 951.6101856460.

The spelling of 861741971 in words is "eight hundred sixty-one million, seven hundred forty-one thousand, nine hundred seventy-one".