102643691 has 2 divisors, whose sum is σ = 102643692. Its totient is φ = 102643690.

The previous prime is 102643633. The next prime is 102643699. The reversal of 102643691 is 196346201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102643691 - 2⁶ = 102643627 is a prime.

It is not a weakly prime, because it can be changed into another prime (102643699) 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, 51321845 + 51321846.

It is an arithmetic number, because the mean of its divisors is an integer number (51321846).

Almost surely, 2^102643691 is an apocalyptic number.

102643691 is a deficient number, since it is larger than the sum of its proper divisors (1).

102643691 is an equidigital number, since it uses as much as digits as its factorization.

102643691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 102643691 is about 10131.3222730303. The cubic root of 102643691 is about 468.2136674403.

Adding to 102643691 its reverse (196346201), we get a palindrome (298989892).

The spelling of 102643691 in words is "one hundred two million, six hundred forty-three thousand, six hundred ninety-one".