861611347 has 2 divisors, whose sum is σ = 861611348. Its totient is φ = 861611346.

The previous prime is 861611291. The next prime is 861611353. The reversal of 861611347 is 743116168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861611347 - 2¹¹ = 861609299 is a prime.

It is a super-2 number, since 2×861611347² = 1484748226558308818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (861611147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430805673 + 430805674.

It is an arithmetic number, because the mean of its divisors is an integer number (430805674).

Almost surely, 2^861611347 is an apocalyptic number.

861611347 is a deficient number, since it is larger than the sum of its proper divisors (1).

861611347 is an equidigital number, since it uses as much as digits as its factorization.

861611347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 861611347 is about 29353.2169787231. The cubic root of 861611347 is about 951.5621011016.

The spelling of 861611347 in words is "eight hundred sixty-one million, six hundred eleven thousand, three hundred forty-seven".