99989261 has 2 divisors, whose sum is σ = 99989262. Its totient is φ = 99989260.

The previous prime is 99989251. The next prime is 99989269. The reversal of 99989261 is 16298999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97397161 + 2592100 = 9869^2 + 1610^2 .

It is an emirp because it is prime and its reverse (16298999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99989261 - 2¹⁴ = 99972877 is a prime.

It is a super-2 number, since 2×99989261² = 19995704630652242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99989269) 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, 49994630 + 49994631.

It is an arithmetic number, because the mean of its divisors is an integer number (49994631).

Almost surely, 2^99989261 is an apocalyptic number.

It is an amenable number.

99989261 is a deficient number, since it is larger than the sum of its proper divisors (1).

99989261 is an equidigital number, since it uses as much as digits as its factorization.

99989261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 53.

The square root of 99989261 is about 9999.4630355835. The cubic root of 99989261 is about 464.1422674256.

The spelling of 99989261 in words is "ninety-nine million, nine hundred eighty-nine thousand, two hundred sixty-one".