26220191 has 2 divisors, whose sum is σ = 26220192. Its totient is φ = 26220190.

The previous prime is 26220163. The next prime is 26220211. The reversal of 26220191 is 19102262.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26220191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26220091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110095 + 13110096.

It is an arithmetic number, because the mean of its divisors is an integer number (13110096).

Almost surely, 2^26220191 is an apocalyptic number.

26220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

26220191 is an equidigital number, since it uses as much as digits as its factorization.

26220191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 26220191 is about 5120.5654961147. The cubic root of 26220191 is about 297.0835582857.

The spelling of 26220191 in words is "twenty-six million, two hundred twenty thousand, one hundred ninety-one".