26981137 has 2 divisors, whose sum is σ = 26981138. Its totient is φ = 26981136.

The previous prime is 26981131. The next prime is 26981147. The reversal of 26981137 is 73118962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 10732176 = 4031^2 + 3276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26981137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26981096 and 26981105.

It is not a weakly prime, because it can be changed into another prime (26981131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13490568 + 13490569.

It is an arithmetic number, because the mean of its divisors is an integer number (13490569).

Almost surely, 2^26981137 is an apocalyptic number.

It is an amenable number.

26981137 is a deficient number, since it is larger than the sum of its proper divisors (1).

26981137 is an equidigital number, since it uses as much as digits as its factorization.

26981137 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 26981137 is about 5194.3370125551. The cubic root of 26981137 is about 299.9301207613.

It can be divided in two parts, 269 and 81137, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 26981137 in words is "twenty-six million, nine hundred eighty-one thousand, one hundred thirty-seven".