97603981 has 2 divisors, whose sum is σ = 97603982. Its totient is φ = 97603980.

The previous prime is 97603963. The next prime is 97603991. The reversal of 97603981 is 18930679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 40525956 = 7555^2 + 6366^2 .

It is a cyclic number.

It is not a de Polignac number, because 97603981 - 2⁷ = 97603853 is a prime.

It is a super-2 number, since 2×97603981² = 19053074214096722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97603951) 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, 48801990 + 48801991.

It is an arithmetic number, because the mean of its divisors is an integer number (48801991).

Almost surely, 2^97603981 is an apocalyptic number.

It is an amenable number.

97603981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97603981 is an equidigital number, since it uses as much as digits as its factorization.

97603981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 97603981 is about 9879.4727086014. The cubic root of 97603981 is about 460.4217634601.

The spelling of 97603981 in words is "ninety-seven million, six hundred three thousand, nine hundred eighty-one".