102989891 has 2 divisors, whose sum is σ = 102989892. Its totient is φ = 102989890.

The previous prime is 102989867. The next prime is 102989897. The reversal of 102989891 is 198989201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102989891 - 2¹⁰ = 102988867 is a prime.

It is not a weakly prime, because it can be changed into another prime (102989897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51494945 + 51494946.

It is an arithmetic number, because the mean of its divisors is an integer number (51494946).

Almost surely, 2^102989891 is an apocalyptic number.

102989891 is a deficient number, since it is larger than the sum of its proper divisors (1).

102989891 is an equidigital number, since it uses as much as digits as its factorization.

102989891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 47.

The square root of 102989891 is about 10148.3935181880. The cubic root of 102989891 is about 468.7394788513.

The spelling of 102989891 in words is "one hundred two million, nine hundred eighty-nine thousand, eight hundred ninety-one".