101520217 has 4 divisors (see below), whose sum is σ = 102418740. Its totient is φ = 100621696.

The previous prime is 101520203. The next prime is 101520227. The reversal of 101520217 is 712025101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712025101 = 241 ⋅2954461.

It can be written as a sum of positive squares in 2 ways, for example, as 53231616 + 48288601 = 7296^2 + 6949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101520217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101520194 and 101520203.

It is not an unprimeable number, because it can be changed into a prime (101520227) 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, 449092 + ... + 449317.

It is an arithmetic number, because the mean of its divisors is an integer number (25604685).

Almost surely, 2^101520217 is an apocalyptic number.

It is an amenable number.

101520217 is a deficient number, since it is larger than the sum of its proper divisors (898523).

101520217 is an equidigital number, since it uses as much as digits as its factorization.

101520217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898522.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 101520217 is about 10075.7241427105. The cubic root of 101520217 is about 466.4991382222.

Adding to 101520217 its reverse (712025101), we get a palindrome (813545318).

The spelling of 101520217 in words is "one hundred one million, five hundred twenty thousand, two hundred seventeen".