26564431 has 2 divisors, whose sum is σ = 26564432. Its totient is φ = 26564430.

The previous prime is 26564423. The next prime is 26564441. The reversal of 26564431 is 13446562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26564431 - 2³ = 26564423 is a prime.

It is a super-2 number, since 2×26564431² = 1411337988707522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26564393 and 26564402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26564401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13282215 + 13282216.

It is an arithmetic number, because the mean of its divisors is an integer number (13282216).

Almost surely, 2^26564431 is an apocalyptic number.

26564431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26564431 is an equidigital number, since it uses as much as digits as its factorization.

26564431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 26564431 is about 5154.0693631343. The cubic root of 26564431 is about 298.3780279746.

The spelling of 26564431 in words is "twenty-six million, five hundred sixty-four thousand, four hundred thirty-one".