106519991 has 2 divisors, whose sum is σ = 106519992. Its totient is φ = 106519990.

The previous prime is 106519979. The next prime is 106519993. The reversal of 106519991 is 199915601.

It is a strong prime.

It is an emirp because it is prime and its reverse (199915601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106519991 - 2¹⁸ = 106257847 is a prime.

It is a super-2 number, since 2×106519991² = 22693016965280162, which contains 22 as substring.

Together with 106519993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106519993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53259995 + 53259996.

It is an arithmetic number, because the mean of its divisors is an integer number (53259996).

Almost surely, 2^106519991 is an apocalyptic number.

106519991 is a deficient number, since it is larger than the sum of its proper divisors (1).

106519991 is an equidigital number, since it uses as much as digits as its factorization.

106519991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 106519991 is about 10320.8522419420. The cubic root of 106519991 is about 474.0349618440.

The spelling of 106519991 in words is "one hundred six million, five hundred nineteen thousand, nine hundred ninety-one".