106556993 has 4 divisors (see below), whose sum is σ = 106611540. Its totient is φ = 106502448.

The previous prime is 106556963. The next prime is 106557007. The reversal of 106556993 is 399655601.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84953089 + 21603904 = 9217^2 + 4648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106556993 is a prime.

It is a super-2 number, since 2×106556993² = 22708785514404098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106556963) 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, 24230 + ... + 28287.

It is an arithmetic number, because the mean of its divisors is an integer number (26652885).

Almost surely, 2^106556993 is an apocalyptic number.

It is an amenable number.

106556993 is a deficient number, since it is larger than the sum of its proper divisors (54547).

106556993 is an equidigital number, since it uses as much as digits as its factorization.

106556993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54546.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 106556993 is about 10322.6446708196. The cubic root of 106556993 is about 474.0898442215.

The spelling of 106556993 in words is "one hundred six million, five hundred fifty-six thousand, nine hundred ninety-three".