101640685 has 4 divisors (see below), whose sum is σ = 121968828. Its totient is φ = 81312544.

The previous prime is 101640659. The next prime is 101640713. The reversal of 101640685 is 586046101.

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 51811204 + 49829481 = 7198^2 + 7059^2 .

It is a cyclic number.

It is not a de Polignac number, because 101640685 - 2⁵ = 101640653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10164064 + ... + 10164073.

It is an arithmetic number, because the mean of its divisors is an integer number (30492207).

Almost surely, 2^101640685 is an apocalyptic number.

It is an amenable number.

101640685 is a deficient number, since it is larger than the sum of its proper divisors (20328143).

101640685 is an equidigital number, since it uses as much as digits as its factorization.

101640685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20328142.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 101640685 is about 10081.7005014035. The cubic root of 101640685 is about 466.6835875384.

Adding to 101640685 its reverse (586046101), we get a palindrome (687686786).

The spelling of 101640685 in words is "one hundred one million, six hundred forty thousand, six hundred eighty-five".