26139331 has 2 divisors, whose sum is σ = 26139332. Its totient is φ = 26139330.

The previous prime is 26139317. The next prime is 26139359. The reversal of 26139331 is 13393162.

It is an a-pointer prime, because the next prime (26139359) can be obtained adding 26139331 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26139331 - 2⁵ = 26139299 is a prime.

It is a super-2 number, since 2×26139331² = 1366529250255122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26139331.

It is not a weakly prime, because it can be changed into another prime (26139361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13069665 + 13069666.

It is an arithmetic number, because the mean of its divisors is an integer number (13069666).

Almost surely, 2^26139331 is an apocalyptic number.

26139331 is a deficient number, since it is larger than the sum of its proper divisors (1).

26139331 is an equidigital number, since it uses as much as digits as its factorization.

26139331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 26139331 is about 5112.6637871075. The cubic root of 26139331 is about 296.7778535106. Note that the first 3 decimals are identical.

The spelling of 26139331 in words is "twenty-six million, one hundred thirty-nine thousand, three hundred thirty-one".