101128639 has 4 divisors (see below), whose sum is σ = 101420424. Its totient is φ = 100836856.

The previous prime is 101128633. The next prime is 101128649. The reversal of 101128639 is 936821101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936821101 = 109 ⋅8594689.

It is a cyclic number.

It is not a de Polignac number, because 101128639 - 2⁵ = 101128607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101128639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101128633) 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, 145372 + ... + 146065.

It is an arithmetic number, because the mean of its divisors is an integer number (25355106).

Almost surely, 2^101128639 is an apocalyptic number.

101128639 is a deficient number, since it is larger than the sum of its proper divisors (291785).

101128639 is an equidigital number, since it uses as much as digits as its factorization.

101128639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291784.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 101128639 is about 10056.2736140183. The cubic root of 101128639 is about 465.8985807767.

The spelling of 101128639 in words is "one hundred one million, one hundred twenty-eight thousand, six hundred thirty-nine".