106891591 has 2 divisors, whose sum is σ = 106891592. Its totient is φ = 106891590.

The previous prime is 106891571. The next prime is 106891601. The reversal of 106891591 is 195198601.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 106891591 - 2⁹ = 106891079 is a prime.

It is a super-2 number, since 2×106891591² = 22851624453022562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106891501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53445795 + 53445796.

It is an arithmetic number, because the mean of its divisors is an integer number (53445796).

Almost surely, 2^106891591 is an apocalyptic number.

106891591 is a deficient number, since it is larger than the sum of its proper divisors (1).

106891591 is an equidigital number, since it uses as much as digits as its factorization.

106891591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 106891591 is about 10338.8389580262. The cubic root of 106891591 is about 474.5855531736.

The spelling of 106891591 in words is "one hundred six million, eight hundred ninety-one thousand, five hundred ninety-one".