99961097 has 2 divisors, whose sum is σ = 99961098. Its totient is φ = 99961096.

The previous prime is 99961079. The next prime is 99961129. The reversal of 99961097 is 79016999.

Together with previous prime (99961079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98624761 + 1336336 = 9931^2 + 1156^2 .

It is an emirp because it is prime and its reverse (79016999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99961097 - 2¹⁶ = 99895561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99961067) 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, 49980548 + 49980549.

It is an arithmetic number, because the mean of its divisors is an integer number (49980549).

Almost surely, 2^99961097 is an apocalyptic number.

It is an amenable number.

99961097 is a deficient number, since it is larger than the sum of its proper divisors (1).

99961097 is an equidigital number, since it uses as much as digits as its factorization.

99961097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 99961097 is about 9998.0546607828. The cubic root of 99961097 is about 464.0986849775.

The spelling of 99961097 in words is "ninety-nine million, nine hundred sixty-one thousand, ninety-seven".