102991069 has 2 divisors, whose sum is σ = 102991070. Its totient is φ = 102991068.

The previous prime is 102991037. The next prime is 102991087. The reversal of 102991069 is 960199201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98208100 + 4782969 = 9910^2 + 2187^2 .

It is a cyclic number.

It is not a de Polignac number, because 102991069 - 2⁵ = 102991037 is a prime.

It is a super-3 number, since 3×102991069³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102991019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51495534 + 51495535.

It is an arithmetic number, because the mean of its divisors is an integer number (51495535).

Almost surely, 2^102991069 is an apocalyptic number.

It is an amenable number.

102991069 is a deficient number, since it is larger than the sum of its proper divisors (1).

102991069 is an equidigital number, since it uses as much as digits as its factorization.

102991069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 102991069 is about 10148.4515567647. The cubic root of 102991069 is about 468.7412659943.

The spelling of 102991069 in words is "one hundred two million, nine hundred ninety-one thousand, sixty-nine".