101504561 has 4 divisors (see below), whose sum is σ = 103980324. Its totient is φ = 99028800.

The previous prime is 101504519. The next prime is 101504573. The reversal of 101504561 is 165405101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165405101 = 2161 ⋅76541.

It can be written as a sum of positive squares in 2 ways, for example, as 9728161 + 91776400 = 3119^2 + 9580^2 .

It is a cyclic number.

It is not a de Polignac number, because 101504561 - 2¹⁸ = 101242417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101504581) 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, 1237820 + ... + 1237901.

It is an arithmetic number, because the mean of its divisors is an integer number (25995081).

Almost surely, 2^101504561 is an apocalyptic number.

It is an amenable number.

101504561 is a deficient number, since it is larger than the sum of its proper divisors (2475763).

101504561 is an equidigital number, since it uses as much as digits as its factorization.

101504561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475762.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 101504561 is about 10074.9471958914. The cubic root of 101504561 is about 466.4751565097.

Adding to 101504561 its reverse (165405101), we get a palindrome (266909662).

The spelling of 101504561 in words is "one hundred one million, five hundred four thousand, five hundred sixty-one".