106631389 has 4 divisors (see below), whose sum is σ = 108643356. Its totient is φ = 104619424.

The previous prime is 106631387. The next prime is 106631407. The reversal of 106631389 is 983136601.

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 42471289 + 64160100 = 6517^2 + 8010^2 .

It is a cyclic number.

It is not a de Polignac number, because 106631389 - 2¹ = 106631387 is a prime.

It is a super-2 number, since 2×106631389² = 22740506240138642, 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 (106631387) 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, 1005904 + ... + 1006009.

It is an arithmetic number, because the mean of its divisors is an integer number (27160839).

Almost surely, 2^106631389 is an apocalyptic number.

It is an amenable number.

106631389 is a deficient number, since it is larger than the sum of its proper divisors (2011967).

106631389 is an equidigital number, since it uses as much as digits as its factorization.

106631389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011966.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 106631389 is about 10326.2475759590. The cubic root of 106631389 is about 474.2001519603.

The spelling of 106631389 in words is "one hundred six million, six hundred thirty-one thousand, three hundred eighty-nine".