106138999 has 4 divisors (see below), whose sum is σ = 106689136. Its totient is φ = 105588864.

The previous prime is 106138987. The next prime is 106139003. The reversal of 106138999 is 999831601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999831601 = 28871 ⋅34631.

It is a cyclic number.

It is not a de Polignac number, because 106138999 - 2¹⁷ = 106007927 is a prime.

It is a super-2 number, since 2×106138999² = 22530974217444002, 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 (106138909) 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, 274779 + ... + 275164.

It is an arithmetic number, because the mean of its divisors is an integer number (26672284).

Almost surely, 2^106138999 is an apocalyptic number.

106138999 is a deficient number, since it is larger than the sum of its proper divisors (550137).

106138999 is an equidigital number, since it uses as much as digits as its factorization.

106138999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550136.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 106138999 is about 10302.3783176507. The cubic root of 106138999 is about 473.4691235195.

The spelling of 106138999 in words is "one hundred six million, one hundred thirty-eight thousand, nine hundred ninety-nine".