106491997 has 2 divisors, whose sum is σ = 106491998. Its totient is φ = 106491996.

The previous prime is 106491967. The next prime is 106492033. The reversal of 106491997 is 799194601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102535876 + 3956121 = 10126^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 106491997 - 2¹⁹ = 105967709 is a prime.

It is a super-2 number, since 2×106491997² = 22681090850096018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106491907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53245998 + 53245999.

It is an arithmetic number, because the mean of its divisors is an integer number (53245999).

Almost surely, 2^106491997 is an apocalyptic number.

It is an amenable number.

106491997 is a deficient number, since it is larger than the sum of its proper divisors (1).

106491997 is an equidigital number, since it uses as much as digits as its factorization.

106491997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 106491997 is about 10319.4959663736. The cubic root of 106491997 is about 473.9934319326.

The spelling of 106491997 in words is "one hundred six million, four hundred ninety-one thousand, nine hundred ninety-seven".