99966631 has 2 divisors, whose sum is σ = 99966632.
Its totient is φ = 99966630.
The previous prime is 99966589. The next prime is 99966673. The reversal of 99966631 is 13666999.
It is a balanced prime because it is at equal distance from previous prime (99966589) and next prime (99966673).
It is an emirp because it is prime and its reverse (13666999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 99966631 - 221 = 97869479 is a prime.
It is a super-2 number, since 2×999666312 = 19986654626980322, which contains 22 as substring.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99966131) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49983315 + 49983316.
It is an arithmetic number, because the mean of its divisors is an integer number (49983316).
Almost surely, 299966631 is an apocalyptic number.
99966631 is the 6324-th centered pentagonal number.
99966631 is a deficient number, since it is larger than the sum of its proper divisors (1).
99966631 is an equidigital number, since it uses as much as digits as its factorization.
99966631 is an evil number, because the sum of its binary digits is even.
The product of its digits is 472392, while the sum is 49.
The square root of 99966631 is about 9998.3314107905.
The cubic root of 99966631 is about 464.1072492250.
The spelling of 99966631 in words is "ninety-nine million, nine hundred sixty-six thousand, six hundred thirty-one".