212190091 has 2 divisors, whose sum is σ = 212190092. Its totient is φ = 212190090.

The previous prime is 212190067. The next prime is 212190109. The reversal of 212190091 is 190091212.

212190091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (212190109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212190091 - 2⁵ = 212190059 is a prime.

It is not a weakly prime, because it can be changed into another prime (212190031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106095045 + 106095046.

It is an arithmetic number, because the mean of its divisors is an integer number (106095046).

Almost surely, 2^212190091 is an apocalyptic number.

212190091 is a deficient number, since it is larger than the sum of its proper divisors (1).

212190091 is an equidigital number, since it uses as much as digits as its factorization.

212190091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 212190091 is about 14566.7460676707. The cubic root of 212190091 is about 596.4513597798.

The spelling of 212190091 in words is "two hundred twelve million, one hundred ninety thousand, ninety-one".