26131321 has 2 divisors, whose sum is σ = 26131322. Its totient is φ = 26131320.

The previous prime is 26131307. The next prime is 26131331. The reversal of 26131321 is 12313162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 9000000 = 4139^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 26131321 - 2⁹ = 26130809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26131331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13065660 + 13065661.

It is an arithmetic number, because the mean of its divisors is an integer number (13065661).

Almost surely, 2^26131321 is an apocalyptic number.

It is an amenable number.

26131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

26131321 is an equidigital number, since it uses as much as digits as its factorization.

26131321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 26131321 is about 5111.8803780996. The cubic root of 26131321 is about 296.7475360621.

Adding to 26131321 its reverse (12313162), we get a palindrome (38444483).

The spelling of 26131321 in words is "twenty-six million, one hundred thirty-one thousand, three hundred twenty-one".