136826981 has 2 divisors, whose sum is σ = 136826982. Its totient is φ = 136826980.

The previous prime is 136826971. The next prime is 136827007. The reversal of 136826981 is 189628631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104734756 + 32092225 = 10234^2 + 5665^2 .

It is a cyclic number.

It is not a de Polignac number, because 136826981 - 2²² = 132632677 is a prime.

It is a super-2 number, since 2×136826981² = 37443245459148722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136826971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68413490 + 68413491.

It is an arithmetic number, because the mean of its divisors is an integer number (68413491).

Almost surely, 2^136826981 is an apocalyptic number.

It is an amenable number.

136826981 is a deficient number, since it is larger than the sum of its proper divisors (1).

136826981 is an equidigital number, since it uses as much as digits as its factorization.

136826981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 136826981 is about 11697.3065703178. The cubic root of 136826981 is about 515.2965659209.

The spelling of 136826981 in words is "one hundred thirty-six million, eight hundred twenty-six thousand, nine hundred eighty-one".