97861 has 2 divisors, whose sum is σ = 97862. Its totient is φ = 97860.

The previous prime is 97859. The next prime is 97871. The reversal of 97861 is 16879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93636 + 4225 = 306^2 + 65^2 .

It is an emirp because it is prime and its reverse (16879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97861 - 2¹ = 97859 is a prime.

Together with 97859, it forms a pair of twin primes.

It is a Chen prime.

97861 is a lucky number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48930 + 48931.

It is an arithmetic number, because the mean of its divisors is an integer number (48931).

2⁹⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

97861 is a deficient number, since it is larger than the sum of its proper divisors (1).

97861 is an equidigital number, since it uses as much as digits as its factorization.

97861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 97861 is about 312.8274284650. The cubic root of 97861 is about 46.0825549658.

The spelling of 97861 in words is "ninety-seven thousand, eight hundred sixty-one".