99988261 has 2 divisors, whose sum is σ = 99988262. Its totient is φ = 99988260.

The previous prime is 99988253. The next prime is 99988277. The reversal of 99988261 is 16288999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 34281025 = 8106^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 99988261 - 2³ = 99988253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99988199 and 99988208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99988961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49994130 + 49994131.

It is an arithmetic number, because the mean of its divisors is an integer number (49994131).

Almost surely, 2^99988261 is an apocalyptic number.

It is an amenable number.

99988261 is a deficient number, since it is larger than the sum of its proper divisors (1).

99988261 is an equidigital number, since it uses as much as digits as its factorization.

99988261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 52.

The square root of 99988261 is about 9999.4130327735. The cubic root of 99988261 is about 464.1407201134.

The spelling of 99988261 in words is "ninety-nine million, nine hundred eighty-eight thousand, two hundred sixty-one".