106645391 has 4 divisors (see below), whose sum is σ = 108453000. Its totient is φ = 104837784.

The previous prime is 106645379. The next prime is 106645393. The reversal of 106645391 is 193546601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 106645391 - 2⁶ = 106645327 is a prime.

It is a super-2 number, since 2×106645391² = 22746478843085762, 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 (106645393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903716 + ... + 903833.

It is an arithmetic number, because the mean of its divisors is an integer number (27113250).

Almost surely, 2^106645391 is an apocalyptic number.

106645391 is a deficient number, since it is larger than the sum of its proper divisors (1807609).

106645391 is an equidigital number, since it uses as much as digits as its factorization.

106645391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807608.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 106645391 is about 10326.9255347369. The cubic root of 106645391 is about 474.2209071369.

The spelling of 106645391 in words is "one hundred six million, six hundred forty-five thousand, three hundred ninety-one".