106388781 has 4 divisors (see below), whose sum is σ = 141851712. Its totient is φ = 70925852.

The previous prime is 106388773. The next prime is 106388797. The reversal of 106388781 is 187883601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 106388781 - 2³ = 106388773 is a prime.

It is a super-2 number, since 2×106388781² = 22637145445331922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106388761) 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, 17731461 + ... + 17731466.

It is an arithmetic number, because the mean of its divisors is an integer number (35462928).

Almost surely, 2^106388781 is an apocalyptic number.

It is an amenable number.

106388781 is a deficient number, since it is larger than the sum of its proper divisors (35462931).

106388781 is an equidigital number, since it uses as much as digits as its factorization.

106388781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35462930.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 106388781 is about 10314.4937345465. The cubic root of 106388781 is about 473.8402450823.

The spelling of 106388781 in words is "one hundred six million, three hundred eighty-eight thousand, seven hundred eighty-one".