97691878243 has 2 divisors, whose sum is σ = 97691878244. Its totient is φ = 97691878242.

The previous prime is 97691878157. The next prime is 97691878267. The reversal of 97691878243 is 34287819679.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97691878243 is a prime.

It is not a weakly prime, because it can be changed into another prime (97691878283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48845939121 + 48845939122.

It is an arithmetic number, because the mean of its divisors is an integer number (48845939122).

Almost surely, 2^97691878243 is an apocalyptic number.

97691878243 is a deficient number, since it is larger than the sum of its proper divisors (1).

97691878243 is an equidigital number, since it uses as much as digits as its factorization.

97691878243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 64.

The spelling of 97691878243 in words is "ninety-seven billion, six hundred ninety-one million, eight hundred seventy-eight thousand, two hundred forty-three".