101002639 has 4 divisors (see below), whose sum is σ = 103466160. Its totient is φ = 98539120.

The previous prime is 101002633. The next prime is 101002669. The reversal of 101002639 is 936200101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936200101 = 347 ⋅2697983.

It is a cyclic number.

It is not a de Polignac number, because 101002639 - 2⁹ = 101002127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101002633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231699 + ... + 1231780.

It is an arithmetic number, because the mean of its divisors is an integer number (25866540).

Almost surely, 2^101002639 is an apocalyptic number.

101002639 is a deficient number, since it is larger than the sum of its proper divisors (2463521).

101002639 is an equidigital number, since it uses as much as digits as its factorization.

101002639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463520.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 101002639 is about 10050.0069154205. The cubic root of 101002639 is about 465.7050068005.

The spelling of 101002639 in words is "one hundred one million, two thousand, six hundred thirty-nine".