97161881 has 2 divisors, whose sum is σ = 97161882. Its totient is φ = 97161880.

The previous prime is 97161809. The next prime is 97161887. The reversal of 97161881 is 18816179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52070656 + 45091225 = 7216^2 + 6715^2 .

It is an emirp because it is prime and its reverse (18816179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97161881 - 2²⁶ = 30053017 is a prime.

It is a super-2 number, since 2×97161881² = 18880862238916322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (97161887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48580940 + 48580941.

It is an arithmetic number, because the mean of its divisors is an integer number (48580941).

Almost surely, 2^97161881 is an apocalyptic number.

It is an amenable number.

97161881 is a deficient number, since it is larger than the sum of its proper divisors (1).

97161881 is an equidigital number, since it uses as much as digits as its factorization.

97161881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 41.

The square root of 97161881 is about 9857.0726384663. The cubic root of 97161881 is about 459.7255467434.

The spelling of 97161881 in words is "ninety-seven million, one hundred sixty-one thousand, eight hundred eighty-one".