26978131 has 2 divisors, whose sum is σ = 26978132. Its totient is φ = 26978130.

The previous prime is 26978129. The next prime is 26978191. The reversal of 26978131 is 13187962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26978131 - 2¹ = 26978129 is a prime.

It is a super-2 number, since 2×26978131² = 1455639104506322, which contains 22 as substring.

Together with 26978129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26978191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13489065 + 13489066.

It is an arithmetic number, because the mean of its divisors is an integer number (13489066).

Almost surely, 2^26978131 is an apocalyptic number.

26978131 is a deficient number, since it is larger than the sum of its proper divisors (1).

26978131 is an equidigital number, since it uses as much as digits as its factorization.

26978131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 26978131 is about 5194.0476509173. The cubic root of 26978131 is about 299.9189818259.

It can be divided in two parts, 269 and 78131, that added together give a square (78400 = 280²).

The spelling of 26978131 in words is "twenty-six million, nine hundred seventy-eight thousand, one hundred thirty-one".