861590647 has 2 divisors, whose sum is σ = 861590648. Its totient is φ = 861590646.

The previous prime is 861590627. The next prime is 861590693. The reversal of 861590647 is 746095168.

It is an a-pointer prime, because the next prime (861590693) can be obtained adding 861590647 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861590647 - 2¹¹ = 861588599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861590597 and 861590606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861590627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430795323 + 430795324.

It is an arithmetic number, because the mean of its divisors is an integer number (430795324).

Almost surely, 2^861590647 is an apocalyptic number.

861590647 is a deficient number, since it is larger than the sum of its proper divisors (1).

861590647 is an equidigital number, since it uses as much as digits as its factorization.

861590647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 861590647 is about 29352.8643747080. The cubic root of 861590647 is about 951.5544806924.

The spelling of 861590647 in words is "eight hundred sixty-one million, five hundred ninety thousand, six hundred forty-seven".