106555551 has 4 divisors (see below), whose sum is σ = 142074072. Its totient is φ = 71037032.

The previous prime is 106555549. The next prime is 106555571. The reversal of 106555551 is 155555601.

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 106555551 - 2¹ = 106555549 is a prime.

It is a super-3 number, since 3×106555551³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106555571) 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, 17759256 + ... + 17759261.

It is an arithmetic number, because the mean of its divisors is an integer number (35518518).

Almost surely, 2^106555551 is an apocalyptic number.

106555551 is a deficient number, since it is larger than the sum of its proper divisors (35518521).

106555551 is an equidigital number, since it uses as much as digits as its factorization.

106555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35518520.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 106555551 is about 10322.5748241415. The cubic root of 106555551 is about 474.0877056456.

Subtracting 106555551 from its reverse (155555601), we obtain a triangular number (49000050 = T₉₈₉₉).

It can be divided in two parts, 1065 and 55551, that added together give a triangular number (56616 = T₃₃₆).

The spelling of 106555551 in words is "one hundred six million, five hundred fifty-five thousand, five hundred fifty-one".