102012091 has 2 divisors, whose sum is σ = 102012092. Its totient is φ = 102012090.

The previous prime is 102012073. The next prime is 102012133. The reversal of 102012091 is 190210201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102012091 - 2¹⁵ = 101979323 is a prime.

It is not a weakly prime, because it can be changed into another prime (102013091) 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, 51006045 + 51006046.

It is an arithmetic number, because the mean of its divisors is an integer number (51006046).

Almost surely, 2^102012091 is an apocalyptic number.

102012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

102012091 is an equidigital number, since it uses as much as digits as its factorization.

102012091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 102012091 is about 10100.1035143210. The cubic root of 102012091 is about 467.2513339122.

Adding to 102012091 its reverse (190210201), we get a palindrome (292222292).

The spelling of 102012091 in words is "one hundred two million, twelve thousand, ninety-one".