99887969 has 2 divisors, whose sum is σ = 99887970. Its totient is φ = 99887968.

The previous prime is 99887947. The next prime is 99887989. The reversal of 99887969 is 96978899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 1183744 = 9935^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 99887969 - 2⁸ = 99887713 is a prime.

It is a super-2 number, since 2×99887969² = 19955212701889922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99887929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49943984 + 49943985.

It is an arithmetic number, because the mean of its divisors is an integer number (49943985).

Almost surely, 2^99887969 is an apocalyptic number.

It is an amenable number.

99887969 is a deficient number, since it is larger than the sum of its proper divisors (1).

99887969 is an equidigital number, since it uses as much as digits as its factorization.

99887969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 65.

The square root of 99887969 is about 9994.3968802525. The cubic root of 99887969 is about 463.9854846455.

The spelling of 99887969 in words is "ninety-nine million, eight hundred eighty-seven thousand, nine hundred sixty-nine".