106891997 has 2 divisors, whose sum is σ = 106891998. Its totient is φ = 106891996.

The previous prime is 106891987. The next prime is 106892021. The reversal of 106891997 is 799198601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 43943641 = 7934^2 + 6629^2 .

It is a cyclic number.

It is not a de Polignac number, because 106891997 - 2²⁴ = 90114781 is a prime.

It is a super-2 number, since 2×106891997² = 22851798045296018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106891907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53445998 + 53445999.

It is an arithmetic number, because the mean of its divisors is an integer number (53445999).

Almost surely, 2^106891997 is an apocalyptic number.

It is an amenable number.

106891997 is a deficient number, since it is larger than the sum of its proper divisors (1).

106891997 is an equidigital number, since it uses as much as digits as its factorization.

106891997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 106891997 is about 10338.8585927074. The cubic root of 106891997 is about 474.5861540363.

The spelling of 106891997 in words is "one hundred six million, eight hundred ninety-one thousand, nine hundred ninety-seven".