26351621 has 2 divisors, whose sum is σ = 26351622. Its totient is φ = 26351620.

The previous prime is 26351617. The next prime is 26351627. The reversal of 26351621 is 12615362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 6002500 = 4511^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 26351621 - 2² = 26351617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26351627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13175810 + 13175811.

It is an arithmetic number, because the mean of its divisors is an integer number (13175811).

Almost surely, 2^26351621 is an apocalyptic number.

It is an amenable number.

26351621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26351621 is an equidigital number, since it uses as much as digits as its factorization.

26351621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 26351621 is about 5133.3829975953. The cubic root of 26351621 is about 297.5791132018.

Adding to 26351621 its reverse (12615362), we get a palindrome (38966983).

The spelling of 26351621 in words is "twenty-six million, three hundred fifty-one thousand, six hundred twenty-one".