99961273 has 2 divisors, whose sum is σ = 99961274. Its totient is φ = 99961272.

The previous prime is 99961271. The next prime is 99961327. The reversal of 99961273 is 37216999.

Together with next prime (99961327) 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., 92409769 + 7551504 = 9613^2 + 2748^2 .

It is an emirp because it is prime and its reverse (37216999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99961273 - 2¹ = 99961271 is a prime.

Together with 99961271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99961271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49980636 + 49980637.

It is an arithmetic number, because the mean of its divisors is an integer number (49980637).

Almost surely, 2^99961273 is an apocalyptic number.

It is an amenable number.

99961273 is a deficient number, since it is larger than the sum of its proper divisors (1).

99961273 is an equidigital number, since it uses as much as digits as its factorization.

99961273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 99961273 is about 9998.0634624911. The cubic root of 99961273 is about 464.0989573545.

The spelling of 99961273 in words is "ninety-nine million, nine hundred sixty-one thousand, two hundred seventy-three".