106201991 has 8 divisors (see below), whose sum is σ = 122910720. Its totient is φ = 89877528.

The previous prime is 106201987. The next prime is 106202021. The reversal of 106201991 is 199102601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 106201991 - 2² = 106201987 is a prime.

It is a super-2 number, since 2×106201991² = 22557725784728162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106201981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95471 + ... + 96576.

It is an arithmetic number, because the mean of its divisors is an integer number (15363840).

Almost surely, 2^106201991 is an apocalyptic number.

106201991 is a deficient number, since it is larger than the sum of its proper divisors (16708729).

106201991 is an equidigital number, since it uses as much as digits as its factorization.

106201991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192133.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 106201991 is about 10305.4350223559. The cubic root of 106201991 is about 473.5627707464.

The spelling of 106201991 in words is "one hundred six million, two hundred one thousand, nine hundred ninety-one".