99963581 has 2 divisors, whose sum is σ = 99963582. Its totient is φ = 99963580.

The previous prime is 99963569. The next prime is 99963593. The reversal of 99963581 is 18536999.

It is a balanced prime because it is at equal distance from previous prime (99963569) and next prime (99963593).

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 28408900 = 8459^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 99963581 - 2⁶ = 99963517 is a prime.

It is a super-2 number, since 2×99963581² = 19985435052687122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99963881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49981790 + 49981791.

It is an arithmetic number, because the mean of its divisors is an integer number (49981791).

Almost surely, 2^99963581 is an apocalyptic number.

It is an amenable number.

99963581 is a deficient number, since it is larger than the sum of its proper divisors (1).

99963581 is an equidigital number, since it uses as much as digits as its factorization.

99963581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 50.

The square root of 99963581 is about 9998.1788841769. The cubic root of 99963581 is about 464.1025291783.

The spelling of 99963581 in words is "ninety-nine million, nine hundred sixty-three thousand, five hundred eighty-one".