26231389 has 2 divisors, whose sum is σ = 26231390. Its totient is φ = 26231388.

The previous prime is 26231383. The next prime is 26231393. The reversal of 26231389 is 98313262.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25583364 + 648025 = 5058^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 26231389 - 2¹¹ = 26229341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26231383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13115694 + 13115695.

It is an arithmetic number, because the mean of its divisors is an integer number (13115695).

Almost surely, 2^26231389 is an apocalyptic number.

It is an amenable number.

26231389 is a deficient number, since it is larger than the sum of its proper divisors (1).

26231389 is an equidigital number, since it uses as much as digits as its factorization.

26231389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 26231389 is about 5121.6588133143. The cubic root of 26231389 is about 297.1258446317.

The spelling of 26231389 in words is "twenty-six million, two hundred thirty-one thousand, three hundred eighty-nine".