97691690287 has 2 divisors, whose sum is σ = 97691690288. Its totient is φ = 97691690286.

The previous prime is 97691690281. The next prime is 97691690321. The reversal of 97691690287 is 78209619679.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97691690287 - 2³ = 97691690279 is a prime.

It is a super-2 number, since 2×97691690287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97691690281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48845845143 + 48845845144.

It is an arithmetic number, because the mean of its divisors is an integer number (48845845144).

Almost surely, 2^97691690287 is an apocalyptic number.

97691690287 is a deficient number, since it is larger than the sum of its proper divisors (1).

97691690287 is an equidigital number, since it uses as much as digits as its factorization.

97691690287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 97691690287 in words is "ninety-seven billion, six hundred ninety-one million, six hundred ninety thousand, two hundred eighty-seven".