97409681 has 2 divisors, whose sum is σ = 97409682. Its totient is φ = 97409680.

The previous prime is 97409651. The next prime is 97409687. The reversal of 97409681 is 18690479.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 8880400 = 9409^2 + 2980^2 .

It is an emirp because it is prime and its reverse (18690479) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97409681 is a prime.

It is a super-2 number, since 2×97409681² = 18977291905043522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97409687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48704840 + 48704841.

It is an arithmetic number, because the mean of its divisors is an integer number (48704841).

Almost surely, 2^97409681 is an apocalyptic number.

It is an amenable number.

97409681 is a deficient number, since it is larger than the sum of its proper divisors (1).

97409681 is an equidigital number, since it uses as much as digits as its factorization.

97409681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 97409681 is about 9869.6342890707. The cubic root of 97409681 is about 460.1160403532.

The spelling of 97409681 in words is "ninety-seven million, four hundred nine thousand, six hundred eighty-one".