26431513 has 2 divisors, whose sum is σ = 26431514. Its totient is φ = 26431512.

The previous prime is 26431507. The next prime is 26431529. The reversal of 26431513 is 31513462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 898704 = 5053^2 + 948^2 .

It is a cyclic number.

It is not a de Polignac number, because 26431513 - 2⁹ = 26431001 is a prime.

It is not a weakly prime, because it can be changed into another prime (26438513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215756 + 13215757.

It is an arithmetic number, because the mean of its divisors is an integer number (13215757).

Almost surely, 2^26431513 is an apocalyptic number.

It is an amenable number.

26431513 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431513 is an equidigital number, since it uses as much as digits as its factorization.

26431513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 26431513 is about 5141.1587215335. The cubic root of 26431513 is about 297.8795400706.

Adding to 26431513 its reverse (31513462), we get a palindrome (57944975).

The spelling of 26431513 in words is "twenty-six million, four hundred thirty-one thousand, five hundred thirteen".