101999969 has 2 divisors, whose sum is σ = 101999970. Its totient is φ = 101999968.

The previous prime is 101999941. The next prime is 102000023. The reversal of 101999969 is 969999101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 44422225 = 7588^2 + 6665^2 .

It is a cyclic number.

It is not a de Polignac number, because 101999969 - 2¹⁶ = 101934433 is a prime.

It is a super-2 number, since 2×101999969² = 20807987352001922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_5869979 and since 101999969 and 5869979 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101999969.

It is not a weakly prime, because it can be changed into another prime (101999939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50999984 + 50999985.

It is an arithmetic number, because the mean of its divisors is an integer number (50999985).

Almost surely, 2^101999969 is an apocalyptic number.

It is an amenable number.

101999969 is a deficient number, since it is larger than the sum of its proper divisors (1).

101999969 is an equidigital number, since it uses as much as digits as its factorization.

101999969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 354294, while the sum is 53.

The square root of 101999969 is about 10099.5034036333. The cubic root of 101999969 is about 467.2328255015.

The spelling of 101999969 in words is "one hundred one million, nine hundred ninety-nine thousand, nine hundred sixty-nine".