26216501 has 4 divisors (see below), whose sum is σ = 26227404. Its totient is φ = 26205600.

The previous prime is 26216453. The next prime is 26216513. The reversal of 26216501 is 10561262.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10561262 = 2 ⋅5280631.

It can be written as a sum of positive squares in 2 ways, for example, as 8994001 + 17222500 = 2999^2 + 4150^2 .

It is a cyclic number.

It is not a de Polignac number, because 26216501 - 2¹⁰ = 26215477 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 (26216521) 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, 80 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (6556851).

Almost surely, 2^26216501 is an apocalyptic number.

It is an amenable number.

26216501 is a deficient number, since it is larger than the sum of its proper divisors (10903).

26216501 is an equidigital number, since it uses as much as digits as its factorization.

26216501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10902.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 26216501 is about 5120.2051716704. The cubic root of 26216501 is about 297.0696213193.

Adding to 26216501 its reverse (10561262), we get a palindrome (36777763).

The spelling of 26216501 in words is "twenty-six million, two hundred sixteen thousand, five hundred one".