101601565 has 8 divisors (see below), whose sum is σ = 131300568. Its totient is φ = 75028800.

The previous prime is 101601553. The next prime is 101601613. The reversal of 101601565 is 565106101.

It can be written as a sum of positive squares in 4 ways, for example, as 10169721 + 91431844 = 3189^2 + 9562^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 101601565 - 2¹⁷ = 101470493 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 781486 + ... + 781615.

It is an arithmetic number, because the mean of its divisors is an integer number (16412571).

Almost surely, 2^101601565 is an apocalyptic number.

It is an amenable number.

101601565 is a deficient number, since it is larger than the sum of its proper divisors (29699003).

101601565 is a wasteful number, since it uses less digits than its factorization.

101601565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563119.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 101601565 is about 10079.7601657976. The cubic root of 101601565 is about 466.6237066462.

Adding to 101601565 its reverse (565106101), we get a palindrome (666707666).

The spelling of 101601565 in words is "one hundred one million, six hundred one thousand, five hundred sixty-five".