97121756191 has 2 divisors, whose sum is σ = 97121756192. Its totient is φ = 97121756190.

The previous prime is 97121756159. The next prime is 97121756209. The reversal of 97121756191 is 19165712179.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97121756191 - 2⁵ = 97121756159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97121756101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48560878095 + 48560878096.

It is an arithmetic number, because the mean of its divisors is an integer number (48560878096).

Almost surely, 2^97121756191 is an apocalyptic number.

97121756191 is a deficient number, since it is larger than the sum of its proper divisors (1).

97121756191 is an equidigital number, since it uses as much as digits as its factorization.

97121756191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 49.

The spelling of 97121756191 in words is "ninety-seven billion, one hundred twenty-one million, seven hundred fifty-six thousand, one hundred ninety-one".